Q: Imac display issues following Yosemite upgrade

Please read this whole message before doing anything.

This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.

The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, by a peripheral device, by a font conflict, or by corruption of the file system or of certain system caches.

Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards, if applicable. Start up in safe mode and log in to the account with the problem. You must hold down the shift key twice: once when you turn on the computer, and again when you log in.

Note: If FileVault is enabled, or if a firmware password is set, or if the startup volume is a software RAID, you can’t do this. Ask for further instructions.

Safe mode is much slower to start up and run than normal, with limited graphics performance, and some things won’t work at all, including sound output and Wi-Fi on certain models. The next normal startup may also be somewhat slow.

The login screen appears even if you usually login automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin.

Test while in safe mode. Same problem?

After testing, restart as usual (not in safe mode) and verify that you still have the problem. Post the results of the test.

1. This procedure is a diagnostic test. It changes nothing, for better or worse, and therefore will not, in itself, solve the problem. But with the aid of the test results, the solution may take a few minutes, instead of hours or days.

Don't be put off by the complexity of these instructions. The process is much less complicated than the description. You do harder tasks with the computer all the time.

2. If you don't already have a current backup, back up all data before doing anything else. The backup is necessary on general principle, not because of anything in the test procedure. Backup is always a must, and when you're having any kind of trouble with the computer, you may be at higher than usual risk of losing data, whether you follow these instructions or not.

There are ways to back up a computer that isn't fully functional. Ask if you need guidance.

3. Below are instructions to run a UNIX shell script, a type of program. As I wrote above, it changes nothing. It doesn't send or receive any data on the network. All it does is to generate a human-readable report on the state of the computer. That report goes nowhere unless you choose to share it. If you prefer, you can act on it yourself without disclosing the contents to me or anyone else.

You should be wondering whether you can believe me, and whether it's safe to run a program at the behest of a stranger. In general, no, it's not safe and I don't encourage it.

In this case, however, there are a couple of ways for you to decide whether the program is safe without having to trust me. First, you can read it. Unlike an application that you download and click to run, it's transparent, so anyone with the necessary skill can verify what it does.

You may not be able to understand the script yourself. But variations of the script have been posted on this website thousands of times over a period of years. The site is hosted by Apple, which does not allow it to be used to distribute harmful software. Any one of the millions of registered users could have read the script and raised the alarm if it was harmful. Then I would not be here now and you would not be reading this message.

Nevertheless, if you can't satisfy yourself that these instructions are safe, don't follow them. Ask for other options.

4. Here's a summary of what you need to do, if you choose to proceed:

☞ Copy a line of text in this window to the Clipboard.

☞ Paste into the window of another application.

☞ Wait for the test to run. It usually takes a few minutes.

☞ Paste the results, which will have been copied automatically, back into a reply on this page.

The sequence is: copy, paste, wait, paste again. You don't need to copy a second time. Details follow.

5. You may have started the computer in "safe" mode. Preferably, these steps should be taken in “normal” mode, under the conditions in which the problem is reproduced. If the system is now in safe mode and works well enough in normal mode to run the test, restart as usual. If you can only test in safe mode, do that.

6. If you have more than one user, and the one affected by the problem is not an administrator, then please run the test twice: once while logged in as the affected user, and once as an administrator. The results may be different. The user that is created automatically on a new computer when you start it for the first time is an administrator. If you can't log in as an administrator, test as the affected user. Most personal Macs have only one user, and in that case this section doesn’t apply. Don't log in as root.

7. The script is a single long line, all of which must be selected. You can accomplish this easily by triple-clicking anywhere in the line. The whole line will highlight, though you may not see all of it in the browser window, and you can then copy it. If you try to select the line by dragging across the part you can see, you won't get all of it.

Triple-click anywhere in the line of text below on this page to select it:

PATH=/usr/bin:/bin:/usr/sbin:/sbin:/usr/libexec;clear;cd;p=(Software Hardware Memory Diagnostics Power FireWire Thunderbolt USB Fonts SerialATA 4 1000 25 5120 KiB/s 1024 85 \\b%% 20480 1 MB/s 25000 ports ' com.clark.\* \*dropbox \*genieo\* \*GoogleDr\* \*k.AutoCAD\* \*k.Maya\* vidinst\* ' DYLD_INSERT_LIBRARIES\ DYLD_LIBRARY_PATH -86 "` route -n get default|awk '/e:/{print $2}' `" 25 N\\/A down up 102400 25600 recvfrom sendto CFBundleIdentifier 25 25 25 1000 MB com.apple.AirPortBaseStationAgent 464843899 51 5120 files );N5=${#p[@]};p[N5]=` networksetup -listnetworkserviceorder|awk ' NR>1 { sub(/^\([0-9]+\) /,"");n=$0;getline;} $NF=="'${p[26]}')" { sub(/.$/,"",$NF);print n;exit;} ' `;f=('\n%s: %s\n' '\n%s\n\n%s\n' '\nRAM details\n%s\n' %s\ %s '%s\n-\t%s\n' );S0() { echo ' { q=$NF+0;$NF="";u=$(NF-1);$(NF-1)="";gsub(/^ +| +$/,"");if(q>='${p[$1]}') printf("%s (UID %s) is using %s '${p[$2]}'",$0,u,q);} ';};s=(' s/[0-9A-Za-z._]+@[0-9A-Za-z.]+\.[0-9A-Za-z]{2,4}/EMAIL/g;/\/Shared/!s/(\/Users\/)[^ /]+/\1USER/g;s/[-0-9A-Fa-f]{22,}/UUID/g;' ' s/^ +//;/de: S|[nst]:/p;' ' {sub(/^ +/,"")};/er:/;/y:/&&$2<'${p[10]} ' 1s/://;3,6d;/[my].+:/d;s/^ {4}//;H;${ g;s/\n$//;/s: [^EO]|x([^08]|02[^F]|8[^0])/p;} ' ' 5h;6{ H;g;/P/!p;} ' ' ($1~/^Cy/&&$3>'${p[11]}')||($1~/^Cond/&&$2!~/^N/) ' ' /:$/{ N;/:.+:/d;s/ *://;b0'$'\n'' };/^ *(V.+ [0N]|Man).+ /{ s/ 0x.... //;s/[()]//g;s/(.+: )(.+)/ (\2)/;H;};$b0'$'\n'' d;:0'$'\n'' x;s/\n\n//;/Apple[ ,]|Genesy|Intel|SMSC/d;s/\n.*//;/\)$/p;' ' s/^.*C/C/;H;${ g;/No th|pms/!p;} ' '/= [^GO]/p' '{$1=""};1' ' /Of/!{ s/^.+is |\.//g;p;} ' ' $0&&!/ / { n++;print;} END { if(n<200) print "com.apple.";} ' ' $3~/[0-9]:[0-9]{2}$/ { gsub(/:[0-9:a-f]{14}/,"");} { print|"tail -n'${p[12]}'";} ' ' NR==2&&$4<='${p[13]}' { print $4;} ' ' END { $2/=256;if($2>='${p[15]}') print int($2) } ' ' NR!=13{next};{sub(/[+-]$/,"",$NF)};'"`S0 21 22`" 'NR!=2{next}'"`S0 37 17`" ' NR!=5||$8!~/[RW]/{next};{ $(NF-1)=$1;$NF=int($NF/10000000);for(i=1;i<=3;i++){$i="";$(NF-1-i)="";};};'"`S0 19 20`" 's:^:/:p' '/\.kext\/(Contents\/)?Info\.plist$/p' 's/^.{52}(.+) <.+/\1/p' ' /Launch[AD].+\.plist$/ { n++;print;} END { print "'${p[41]}'";if(n<200) print "/System/";} ' '/\.xpc\/(Contents\/)?Info\.plist$/p' ' NR>1&&!/0x|\.[0-9]+$|com\.apple\.launchctl\.(Aqua|Background|System)$|'${p[41]}'/ { print $3;} ' ' /\.(framew|lproj)|\):/d;/plist:|:.+(Mach|scrip)/s/:[^:]+//p ' '/^root$/p' ' !/\/Contents\/.+\/Contents|Applic|Autom|Frameworks/&&/Lib.+\/Info.plist$/ { n++;print;} END { if(n<1100) print "/System/";} ' '/^\/usr\/lib\/.+dylib$/p' ' /Temp|emac/{next};/(etc|Preferences|Launch[AD].+)\// { sub(".(/private)?","");n++;print;} END { print "'${p[41]}'.plist\t'${p[42]}'";if(n<500) print "Launch";} ' ' /\/(Contents\/.+\/Contents|Frameworks)\/|\.wdgt\/.+\.([bw]|plu)/d;p;' 's/\/(Contents\/)?Info.plist$//;p' ' { gsub("^| |\n","\\|\\|kMDItem'${p[35]}'=");sub("^...."," ") };1 ' p '{print $3"\t"$1}' 's/\'$'\t''.+//p' 's/1/On/p' '/Prox.+: [^0]/p' '$2>'${p[43]}'{$2=$2-1;print}' ' BEGIN { i="'${p[26]}'";M1='${p[16]}';M2='${p[18]}';M3='${p[31]}';M4='${p[32]}';} !/^A/{next};/%/ { getline;if($5<M1) a="user "$2"%, system "$4"%";} /disk0/&&$4>M2 { b=$3" ops/s, "$4" blocks/s";} $2==i { if(c) { d=$3+$4+$5+$6;next;};if($4>M3||$6>M4) c=int($4/1024)" in, "int($6/1024)" out";} END { if(a) print "CPU: "a;if(b) print "I/O: "b;if(c) print "Net: "c" (KiB/s)";if(d) print "Net errors: "d" packets/s";} ' ' /r\[0\] /&&$NF!~/^1(0|72\.(1[6-9]|2[0-9]|3[0-1])|92\.168)\./ { print $NF;exit;} ' ' !/^T/ { printf "(static)";exit;} ' '/apsd|BKAg|OpenD/!s/:.+//p' ' (/k:/&&$3!~/(255\.){3}0/ )||(/v6:/&&$2!~/A/ ) ' ' $1~"lR"&&$2<='${p[25]}';$1~"li"&&$3!~"wpa2";' ' BEGIN { FS=":";p="uniq -c|sed -E '"'s/ +\\([0-9]+\\)\\(.+\\)/\\\2 x\\\1/;s/x1$//'"'";} { n=split($3,a,".");sub(/_2[01].+/,"",$3);print $2" "$3" "a[n]$1|p;b=b$1;} END { close(p);if(b) print("\n\t* Code injection");} ' ' NR!=4{next} {$NF/=10240} '"`S0 27 14`" ' END { if($3~/[0-9]/)print$3;} ' ' BEGIN { L='${p[36]}';} !/^[[:space:]]*(#.*)?$/ { l++;if(l<=L) f=f"\n   "$0;} END { F=FILENAME;if(!F) exit;if(!f) f="\n   [N/A]";"file -b "F|getline T;if(T!~/^(AS.+ (En.+ )?text$|(Bo|PO).+ sh.+ text ex)/) F=F" ("T")";printf("\nContents of %s\n%s\n",F,f);if(l>L) printf("\n   ...and %s more line(s)\n",l-L);} ' ' s/^ ?n...://p;s/^ ?p...:/-'$'\t''/p;' 's/0/Off/p' ' END{print NR} ' ' /id: N|te: Y/{i++} END{print i} ' ' / / { print "'"${p[28]}"'";exit;};1;' '/ en/!s/\.//p' ' NR!=13{next};{sub(/[+-M]$/,"",$NF)};'"`S0 39 40`" ' $10~/\(L/&&$9!~"localhost" { sub(/.+:/,"",$9);print $1": "$9;} ' '/^ +r/s/.+"(.+)".+/\1/p' 's/(.+\.wdgt)\/(Contents\/)?Info\.plist$/\1/p' 's/^.+\/(.+)\.wdgt$/\1/p' ' /l: /{ /DVD/d;s/.+: //;b0'$'\n'' };/s: /{ /V/d;s/^ */- /;H;};$b0'$'\n'' d;:0'$'\n'' x;/APPLE [^:]+$/d;p;' ' /^find: /d;p;' "`S0 44 45`" ' BEGIN{FS="= "} /Path/{print $2} ' ' /^ *$/d;s/^ */   /;' );c1=(system_profiler pmset\ -g nvram fdesetup find syslog df vm_stat sar ps sudo\ crontab sudo\ iotop top pkgutil 'PlistBuddy 2>&1 -c "Print' whoami cksum kextstat launchctl sudo\ launchctl crontab 'sudo defaults read' stat lsbom mdfind ' for i in ${p[24]};do ${c1[18]} ${c2[27]} $i;done;' defaults\ read scutil sudo\ dtrace sudo\ profiles sed\ -En awk /S*/*/P*/*/*/C*/*/airport networksetup mdutil sudo\ lsof test osascript\ -e );c2=(com.apple.loginwindow\ LoginHook '" /L*/P*/loginw*' "'tell app \"System Events\" to get properties of login items'|tr , \\\n" 'L*/Ca*/com.ap*.Saf*/E*/* -d 1 -name In*t -exec '"${c1[14]}"' :CFBundleDisplayName" {} \;|sort|uniq' '~ $TMPDIR.. \( -flags +sappnd,schg,uappnd,uchg -o ! -user $UID -o ! -perm -600 \)' '.??* -path .Trash -prune -o -type d -name *.app -print -prune' :${p[35]}\" :Label\" '{/,}L*/{Con,Pref}* -type f ! -size 0 -name *.plist -exec plutil -s {} \;' "-f'%N: %l' Desktop L*/Keyc*" therm sysload boot-args status " -F '\$Time \$Message' -k Sender kernel -k Message Req 'bad |Beac|caug|corru|dead[^bl]|FAIL|fail|GPU |hfs: Ru|inval|jnl:|last value [1-9]|n Cause: -|NVDA\(|pagin|proc: t|Roamed|rror|ssert|Thrott|tim(ed? ?|ing )o|WARN' -k Message Rne 'Goog|ksadm|SMC:| VALI|xpma' -o -k Sender fseventsd -k Message Req 'SL' " '-du -n DEV -n EDEV 1 10' 'acrx -o comm,ruid,%cpu' '-t1 10 1' '-f -pfc /var/db/r*/com.apple.*.{BS,Bas,Es,J,OSXU,Rem,up}*.bom' '{/,}L*/Lo*/Diag* -type f -regex .\*[cght] ! -name .?\* ! -name \*ag \( -exec grep -lq "^Thread c" {} \; -exec printf \* \; -o -true \) -execdir stat -f:%Sc:%N -t%F {} \;|sort -t: -k2 |tail -n'${p[38]} '/S*/*/Ca*/*xpc* >&- ||echo No' '-L /{S*/,}L*/StartupItems -type f -exec file {} +' '-L /S*/L*/{C*/Sec*A,Ex}* {/,}L*/{A*d,Ca*/*/Ex,Co{mpon,reM},Ex,In{p,ter},iTu*/*P,Keyb,Mail/B,Pr*P,Qu*T,Scripti,Sec,Servi,Spo,Widg}* -path \\*s/Resources -prune -o -type f -name Info.plist' '/usr/lib -type f -name *.dylib' `awk "${s[31]}"<<<${p[23]}` "/e*/{auto,{cron,fs}tab,hosts,{[lp],sy}*.conf,mach_i*/*,pam.d/*,ssh{,d}_config,*.local} {,/usr/local}/etc/periodic/*/* /L*/P*{,/*}/com.a*.{Bo,sec*.ap}*t {/S*/,/,}L*/Lau*/*t .launchd.conf" list getenv /Library/Preferences/com.apple.alf\ globalstate --proxy '-n get default' -I --dns -getdnsservers\ "${p[N5]}" -getinfo\ "${p[N5]}" -P -m\ / '' -n1 '-R -l1 -n1 -o prt -stats command,uid,prt' '--regexp --only-files --files com.apple.pkg.*|sort|uniq' -kl -l -s\ / '-R -l1 -n1 -o mem -stats command,uid,mem' '+c0 -i4TCP:0-1023' com.apple.dashboard\ layer-gadgets '-d /L*/Mana*/$USER&&echo On' '-app Safari WebKitDNSPrefetchingEnabled' "+c0 -l|awk '{print(\$1,\$3)}'|sort|uniq -c|sort -n|tail -1|awk '{print(\$2,\$3,\$1)}'" );N1=${#c2[@]};for j in {0..9};do c2[N1+j]=SP${p[j]}DataType;done;N2=${#c2[@]};for j in 0 1;do c2[N2+j]="-n ' syscall::'${p[33+j]}':return { @out[execname,uid]=sum(arg0) } tick-10sec { trunc(@out,1);exit(0);} '";done;l=(Restricted\ files Hidden\ apps 'Elapsed time (s)' POST Battery Safari\ extensions Bad\ plists 'High file counts' User Heat System\ load boot\ args FileVault Diagnostic\ reports Log 'Free space (MiB)' 'Swap (MiB)' Activity 'CPU per process' Login\ hook 'I/O per process' Mach\ ports kexts Daemons Agents XPC\ cache Startup\ items Admin\ access Root\ access Bundles dylibs Apps Font\ issues Inserted\ dylibs Firewall Proxies DNS TCP/IP Wi-Fi Profiles Root\ crontab User\ crontab 'Global login items' 'User login items' Spotlight Memory Listeners Widgets Parental\ Controls Prefetching SATA Descriptors );N3=${#l[@]};for i in 0 1 2;do l[N3+i]=${p[5+i]};done;N4=${#l[@]};for j in 0 1;do l[N4+j]="Current ${p[29+j]}stream data";done;A0() { id -G|grep -qw 80;v[1]=$?;((v[1]==0))&&sudo true;v[2]=$?;v[3]=`date +%s`;clear >&-;date '+Start time: %T %D%n';};for i in 0 1;do eval ' A'$((1+i))'() { v=` eval "${c1[$1]} ${c2[$2]}"|'${c1[30+i]}' "${s[$3]}" `;[[ "$v" ]];};A'$((3+i))'() { v=` while read i;do [[ "$i" ]]&&eval "${c1[$1]} ${c2[$2]}" \"$i\"|'${c1[30+i]}' "${s[$3]}";done<<<"${v[$4]}" `;[[ "$v" ]];};A'$((5+i))'() { v=` while read i;do '${c1[30+i]}' "${s[$1]}" "$i";done<<<"${v[$2]}" `;[[ "$v" ]];};';done;A7(){ v=$((`date +%s`-v[3]));};B2(){ v[$1]="$v";};for i in 0 1;do eval ' B'$i'() { v=;((v['$((i+1))']==0))||{ v=No;false;};};B'$((3+i))'() { v[$2]=`'${c1[30+i]}' "${s[$3]}"<<<"${v[$1]}"`;} ';done;B5(){ v[$1]="${v[$1]}"$'\n'"${v[$2]}";};B6() { v=` paste -d: <(printf "${v[$1]}") <(printf "${v[$2]}")|awk -F: ' {printf("'"${f[$3]}"'",$1,$2)} ' `;};B7(){ v=`grep -Fv "${v[$1]}"<<<"$v"`;};C0() { [[ "$v" ]]&&sed -E "$s"<<<"$v";};C1() { [[ "$v" ]]&&printf "${f[$1]}" "${l[$2]}" "$v"|sed -E "$s";};C2() { v=`echo $v`;[[ "$v" != 0 ]]&&C1 0 $1;};C3() { v=`sed -E "${s[63]}"<<<"$v"`&&C1 1 $1;};for i in 1 2;do for j in 0 2 3;do eval D$i$j'(){ A'$i' $1 $2 $3; C'$j' $4;};';done;done;{ A0;D20 0 $((N1+1)) 2;D10 0 $N1 1;B0;C2 27;B0&&! B1&&C2 28;D12 15 37 25 8;A1 0 $((N1+2)) 3;C0;D13 0 $((N1+3)) 4 3;D23 0 $((N1+4)) 5 4;D13 0 $((N1+9)) 59 50;for i in 0 1 2;do D13 0 $((N1+5+i)) 6 $((N3+i));done;D13 1 10 7 9;D13 1 11 8 10;D22 2 12 9 11;D12 3 13 10 12;D23 4 19 44 13;D23 5 14 12 14;D22 6 36 13 15;D22 7 37 14 16;D23 8 15 38 17;D22 9 16 16 18;B1&&{ D22 35 49 61 51;D22 11 17 17 20;for i in 0 1;do D22 28 $((N2+i)) 45 $((N4+i));done;};D22 12 44 54 45;D22 12 39 15 21;A1 13 40 18;B2 4;B3 4 0 19;A3 14 6 32 0;B4 0 5 11;A1 17 41 20;B7 5;C3 22;B4 4 6 21;A3 14 7 32 6;B4 0 7 11;B3 4 0 22;A3 14 6 32 0;B4 0 8 11;B5 7 8;B1&&{ A2 19 26 23;B7 7;C3 23;};A2 18 26 23;B7 7;C3 24;D13 4 21 24 26;B4 4 12 26;B3 4 13 27;A1 4 22 29;B7 12;B2 14;A4 14 6 52 14;B2 15;B6 14 15 4;B3 0 0 30;C3 29;A1 4 23 27;B7 13;C3 30;D13 24 24 32 31;D13 25 37 32 33;A2 23 18 28;B2 16;A2 16 25 33;B7 16;B3 0 0 34;B2 21;A6 47 21&&C0;B1&&{ D13 21 0 32 19;D13 10 42 32 40;D22 29 35 46 39;};D23 14 1 62 42;D12 34 43 53 44;D12 22 20 32 25;D22 0 $((N1+8)) 51 32;D13 4 8 41 6;D12 26 28 35 34;D13 27 29 36 35;A2 27 32 39&&{ B2 19;A2 33 33 40;B2 20;B6 19 20 3;};C2 36;D23 33 34 42 37;B1&&D23 35 45 55 46;D23 32 31 43 38;D12 36 47 32 48;D13 20 42 32 41;D13 37 2 48 43;D13 4 5 32 1;D13 4 3 60 5;D12 26 48 49 49;B3 4 22 57;A1 26 46 56;B7 22;B3 0 0 58;C3 47;D22 4 4 50 0;D23 22 9 37 7;A7;C2 2;} 2>/dev/null|pbcopy;exit 2>&-

Copy the selected text to the Clipboard by pressing the key combination command-C.

8. Launch the built-in Terminal application in any of the following ways:

☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)

☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.

☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.

Click anywhere in the Terminal window and paste by pressing command-V. The text you pasted should vanish immediately. If it doesn't, press the return key.

9. If you see an error message in the Terminal window such as "Syntax error" or "Event not found," enter

exec bash

and press return. Then paste the script again.

10. If you're logged in as an administrator, you'll be prompted for your login password. Nothing will be displayed when you type it. You will not see the usual dots in place of typed characters. Make sure caps lock is off. Type carefully and then press return. You may get a one-time warning to be careful. If you make three failed attempts to enter the password, the test will run anyway, but it will produce less information. In most cases, the difference is not important. If you don't know the password, or if you prefer not to enter it, press the key combination control-C or just press return  three times at the password prompt. Again, the script will still run.

If you're not logged in as an administrator, you won't be prompted for a password. The test will still run. It just won't do anything that requires administrator privileges.

11. The test may take a few minutes to run, depending on how many files you have and the speed of the computer. A computer that's abnormally slow may take longer to run the test. While it's running, there will be nothing in the Terminal window and no indication of progress. Wait for the line

[Process completed]

to appear. If you don't see it within half an hour or so, the test probably won't complete in a reasonable time. In that case, close the Terminal window and report what happened. No harm will be done.

12. When the test is complete, quit Terminal. The results will have been copied to the Clipboard automatically. They are not shown in the Terminal window. Please don't copy anything from there. All you have to do is start a reply to this comment and then paste by pressing command-V again.

At the top of the results, there will be a line that begins with the words "Start time." If you don't see that, but instead see a mass of gibberish, you didn't wait for the "Process completed" message to appear in the Terminal window. Please wait for it and try again.

If any private information, such as your name or email address, appears in the results, anonymize it before posting. Usually that won't be necessary.

13. When you post the results, you might see an error message on the web page: "You have included content in your post that is not permitted," or "You are not authorized to post." That's a bug in the forum software. Please post the test results on Pastebin, then post a link here to the page you created.

14. This is a public forum, and others may give you advice based on the results of the test. They speak only for themselves, and I don't necessarily agree with them.

______________________________________________________________

Copyright © 2014 by Linc Davis. As the sole author of this work, I reserve all rights to it except as provided in the Use Agreement for the Apple Support Communities website ("ASC"). Readers of ASC may copy it for their own personal use. Neither the whole nor any part may be redistributed.

I had the same problem, Colin; here are the steps I took to return to normal:

1. Booted into Recovery Mode (Cmd-R on startup) and used Disk Utility to repair both permissions and disk.
2. Followed the Safe Boot instructions provided by Linc Davis in his original reply.
3. Tested basic actions (moving mouse, clicking items, etc.). The iMac display no longer showed signs of distortion.
4. Reviewed my account login items: MS Database Daemon, Dropbox, Fantistical and EyeTV. I had already successfully updated another machine, and the only login item difference was EyeTV Helper. I removed the login item and moved the entire EyeTV folder at /Library/Application Support/Eye TV/ to my desktop.
5. Upgraded iWork, iPhoto, iMovie apps, MS Office (I realize it is not a best practice to upgrade software in the midst of troubleshooting, but I wanted an extended set of real-life test actions to ensure things were working normal).
6. Repaired permissions again (a common practice after major software updates).
7. Shut down the iMac, plugged in the USB peripherals (Time Machine, printer, Elgato box), and restarted.
8. The computer continued to perform normally without the previous distortion.
9. Downloaded new, early-release Yosemite-friendly EyeTV software from Elgato's website http://help.elgato.com/customer/portal/articles/1731720-eyetv-3-6-6-is-available -for-use-with-os-x-10-10-yosemite?b_id=360 (Note: the web page advises this software will be updated/finalized sometime around 10/24/2014). Eye TV rebuilt its folder in /Library/Application Support, re-installed the Eye TV Helper login item, and restored my serial number and preferences without me having to do anything. (After verifying everything worked, I trashed the original Eye TV folder I had moved to the desktop in step 4.) A final challenge was that Eye TV did not work: the Live TV window only displayed a black box, and was not reporting errors. I unplugged the three cables of the Elgato box (power, USB, and cable), waited a minute or so, plugged everything back in and all seems to work as before I installed Yosemite.

The display distortion has not re-emerged, including after a couple more test shutdowns/restarts. If Eye TV was the culprit, the new version seems to have solved the problem. It makes sense that Eye TV could cause display issues because Eye TV interacts directly with the display.

BTW: Nice, thorough instructions in the original and subsequent replies, Linc.

Hope this helps.

Jim

Well, as is too often the case, the initial solution isn't quite correct.

After I posted the message above, I was able to use the computer without trouble for about six hours (including using Eye TV on a football-heavy Saturday). However at the end of the night when I plugged my iPhone in, the display problem started. This morning, the problem remains and when I tried to use the machine, the display immediately went from splotchy to an entirely frozen computer. Here is a photo of a portion of the screen and menu bar:

I had to force restart into Safe Mode, at the end of which I received a OS X message that "A  graphics problem has been detected." The Console has numerous kernel GPURestart reports wherein the GPU is trying to debug itself.

For now I have simplified my Desktop Background to a solid color, removed the Eye TV software, and reboot normally. I plugged in my iPhone to see if it would trigger a display problem as it did last night, but it did not. For the moment, everything appears to be fine. I'll let it run (without EyeTV or the Elgato box) and if the display distortion reappears I'll report back. Cheers.

I have exactly the same problem but with my 27" iMac mid 2011. After comes from sleep I get pixelated blocks in random areas that stay on background until open a new app window. Last night my computer frozen and got pixelated blocks all over the screen. After restart got the graphics problem and asked me to report it which I did. I restored Mavericks from my time machine and everything is working fine again. I'm gonna try a clean install of Yosemite but I'm gonna wait a few days before do that. Here is a pic of the pixelated block. I can't get this pic doing a screen capture.

Same issue here on 2010 27" iMac i7. Installed GM version of 10.10 and graphics issue started.

Picture

10 sec video

Hi Linc Davis

I have the same issue. Below results of your test.

Thanks

Start time: 10:34:17 10/22/14

Model Identifier: iMac11,3

System Version: OS X 10.10 (14A389)

Kernel Version: Darwin 14.0.0

Time since boot: 14:35

SATA

   WDC WD1001FALS-40Y6A0                  

FileVault: FileVault master keychain appears to be installed

Diagnostic reports

   2014-10-22 Kernel gpuRestart x18

Log

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:08:33 BUG in process suhelperd[203]: over-released legacy external boost assertions (1 total, 1 external, 0 legacy-external)

   Oct 22 10:10:33 process Safari[10449] caught causing excessive wakeups. Observed wakeups rate (per sec): 169; Maximum permitted wakeups rate (per sec): 150; Observation period: 300 seconds; Task lifetime number of wakeups: 46246

kexts

   com.rim.driver.BlackBerryUSBDriverInt (0.0.97)

Daemons

   com.rim.BBDaemon

   com.microsoft.office.licensing.helper

   com.trusteer.rooks.rooksd

   com.adobe.fpsaud

   com.macpaw.CleanMyMac2.Agent

Agents

   com.trusteer.rapport.rapportd

   com.rim.BBLaunchAgent

   com.macpaw.CleanMyMac2Helper.diskSpaceWatcher

   com.adobe.ARM.UUID

   com.rim.RimAlbumArtDaemon

   com.macpaw.CleanMyMac2Helper.trashWatcher

   com.macpaw.CleanMyMac2Helper.scheduledScan

   com.google.keystone.user.agent

Bundles

   /System/Library/Extensions/AppleI2CPMU.kext

   - com.apple.driver.AppleI2CPMU

   /System/Library/Extensions/JMicronATA.kext

   - com.jmicron.JMicronATA

   /System/Library/Extensions/RIMBBUSB.kext

   - com.rim.driver.BlackBerryUSBDriverInt

   /System/Library/Extensions/RIMBBVSP.kext

   - com.rim.driver.BlackBerryUSBDriverVSP

   /Library/Audio/MIDI Drivers/EmagicUSBMIDIDriver.plugin

   - info.emagic.driver.unitor

   /Library/Internet Plug-Ins/AdobePDFViewer.plugin

   - com.adobe.acrobat.pdfviewer

   /Library/Internet Plug-Ins/AdobePDFViewerNPAPI.plugin

   - com.adobe.acrobat.pdfviewerNPAPI

   /Library/Internet Plug-Ins/CANONiMAGEGATEWAYDL.plugin

   - jp.Canon.cig.npdownload

   /Library/Internet Plug-Ins/CANONiMAGEGATEWAYLI.plugin

   - jp.Canon.cig.nplogin

   /Library/Internet Plug-Ins/Disabled Plug-Ins/Windows Media Plugin

   - com.microsoft.WMP.defaultplugin

   /Library/Internet Plug-Ins/Disabled Plug-Ins/Windows Media Plugin/Contents/Resources/English.lproj

   - N/A

   /Library/Internet Plug-Ins/DRM Plugin.bundle

   - com.microsoft.DRMPlugin

   /Library/Internet Plug-Ins/EPPEX Plugin.plugin

   - N/A

   /Library/Internet Plug-Ins/F5 Inspection Host Plugin.plugin

   - com.f5.inspectionhostplugin

   /Library/Internet Plug-Ins/Flip4Mac WMV Plugin.webplugin

   - net.telestream.wmv.webplugin

   /Library/Internet Plug-Ins/Google Earth Web Plug-in.plugin

   - com.Google.GoogleEarthPlugin.plugin

   /Library/Internet Plug-Ins/JavaAppletPlugin.plugin

   - com.apple.java.JavaAppletPlugin

   /Library/Internet Plug-Ins/SharePointBrowserPlugin.plugin

   - com.microsoft.sharepoint.browserplugin

   /Library/Internet Plug-Ins/SharePointWebKitPlugin.webplugin

   - com.microsoft.sharepoint.webkitplugin

   /Library/Internet Plug-Ins/Silverlight.plugin

   - com.microsoft.SilverlightPlugin

   /Library/PreferencePanes/Flash Player.prefPane

   - com.adobe.flashplayerpreferences

   /Library/PreferencePanes/RapportPreferences.prefPane

   - com.trusteer.RapportPreferences

   /Library/QuickTime/CanonMJPEGAVI.component

   - jp.co.canon.MJPEGAVIExporter

   /Library/QuickTime/CanonMJPEGAVIDec.component

   - jp.co.canon.CanonMJPEGAVIDec

   /Library/QuickTime/CanonText.component

   - jp.co.canon.Text

   /Library/QuickTime/Sonix SN9C102p WebCam.component

   - tw.com.sonix.webcam.sn9c102p

   /Library/Spotlight/iWeb.mdimporter

   - com.apple.MDImporter.iWeb

   /Library/Spotlight/Microsoft Entourage.mdimporter

   - com.microsoft.entourageMDImporter

   /Library/Widgets/CI Filter Browser.wdgt

   - com.apple.CIFilterBrowser

   Library/Address Book Plug-Ins/BTGoogleDirections.bundle

   - com.briantoth.addressbook.btgoogledirections

   Library/Address Book Plug-Ins/BTGoogleEarth.bundle

   - com.briantoth.addressbook.BTGoogleEarth

   Library/Address Book Plug-Ins/BTGoogleMaps.bundle

   - com.briantoth.addressbook.btgooglemaps

   Library/Address Book Plug-Ins/BTGooglePreferences.bundle

   - com.briantoth.addressbook.btgooglepreferences

   Library/Address Book Plug-Ins/SkypeABDialer.bundle

   - com.skype.skypeabdialer

   Library/Address Book Plug-Ins/SkypeABSMS.bundle

   - com.skype.skypeabsms

   Library/Caches/com.apple.Safari/Extensions/Amazon Shopping Assistant.safariextension

   - com.spigot.safari.amazonshopassist

   Library/Caches/com.apple.Safari/Extensions/My eBay Manager-2.safariextension

   - com.ebay.safari.myebaymanager

   Library/Caches/com.apple.Safari/Extensions/Slick Savings.safariextension

   - com.spigot.safari.slicksavings

   Library/Internet Plug-Ins/F5 Inspection Host Plugin.plugin

   - com.f5.inspectionhostplugin

   Library/Internet Plug-Ins/Google Earth Web Plug-in.plugin

   - com.Google.GoogleEarthPlugin.plugin

   Library/Widgets/AccuWeather.com.wdgt

   - com.apple.widget.accuweatherv1

   Library/Widgets/APOD Viewer.wdgt

   - com.haubergs.apod

   Library/Widgets/eCalc.wdgt

   - com.eCalc.widget.calculator

   Library/Widgets/Euro Stocks.wdgt

   - eu.broes.widget.eurostocks

   Library/Widgets/FranceTrafic.wdgt

   - com.labo-apple.supinfo.FranceTrafic

   Library/Widgets/HurricaneCompanion.wdgt

   - ocom.travelwidgets.hurricanecompanion

   Library/Widgets/Matrix.wdgt

   - de.uni-heepen.widget.Matrix

   Library/Widgets/RadarInMotion.wdgt

   - com.kamalaboulhosn.radarinmotion2

   Library/Widgets/Sunlit Earth.wdgt

   - edu.tamu.physics.astronomy.widget.sunwidget

   Library/Widgets/Voices.wdgt

   - com.apple.widget.voices

   Library/Widgets/Wikipedia.wdgt

   - com.whatsinthehouse.widget.wikipedia

Apps

   /Applications/Dropbox.app

Contents of /System/Library/LaunchDaemons/com.apple.installer.osmessagetracing.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.apple.installer.osmessagetracing</string>

    <key>LaunchOnlyOnce</key>

    <true/>

    <key>ProgramArguments</key>

    <array>

    <string>/System/Library/PrivateFrameworks/OSInstaller.framework/Resources/OSMes sageTracer</string>

    </array>

    <key>UserName</key>

    <string>root</string>

    <key>GroupName</key>

    <string>wheel</string>

    <key>WatchPaths</key>

    <array>

    <string>/var/db/.AppleDiagnosticsSetupDone</string>

    </array>

   </dict>

   </plist>

Contents of /Library/LaunchAgents/com.rim.BBAlbumArtCacher.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>KeepAlive</key>

    <true/>

    <key>Label</key>

    <string>com.rim.RimAlbumArtDaemon</string>

    <key>OnDemand</key>

    <false/>

    <key>Program</key>

    <string>/Library/Application Support/BlackBerry/RimAlbumArtDaemon</string>

    <key>ProgramArguments</key>

    <array>

    <string>RimAlbumArtDaemon</string>

    </array>

    <key>RunAtLoad</key>

    <true/>

   </dict>

   </plist>

Contents of /Library/LaunchAgents/com.rim.BBLaunchAgent.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>KeepAlive</key>

    <true/>

    <key>Label</key>

    <string>com.rim.BBLaunchAgent</string>

    <key>OnDemand</key>

    <false/>

    <key>Program</key>

    <string>/Library/Application Support/BlackBerry/BBLaunchAgent.app</string>

    <key>ProgramArguments</key>

    <array>

    <string>BBLaunchAgent</string>

    </array>

    <key>RunAtLoad</key>

    <true/>

   </dict>

   </plist>

Contents of /Library/LaunchAgents/com.trusteer.rapport.rapportd.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.trusteer.rapport.rapportd</string>

    <key>ProgramArguments</key>

    <array>

    <string>/Library/Rapport/bin/rapportd.app/Contents/MacOS/rapportd</string>

    </array>

    <key>RunAtLoad</key>

    <true/>

    <key>WorkingDirectory</key>

    <string>/Library/Rapport/bin</string>

    <key>LimitLoadToSessionType</key>

    <string>Aqua</string>

    <key>Umask</key>

    <integer>18</integer>

   </dict>

   </plist>

Contents of /Library/LaunchDaemons/com.adobe.fpsaud.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.adobe.fpsaud</string>

    <key>ProgramArguments</key>

    <array>

    <string>/Library/Application Support/Adobe/Flash Player Install Manager/fpsaud</string>

    </array>

    <key>StartInterval</key>

    <integer>3600</integer>

    <key>KeepAlive</key>

    <false/>

   </dict>

   </plist>

Contents of /Library/LaunchDaemons/com.apple.aelwriter.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.apple.aelwriter</string>

    <key>MachServices</key>

    <dict>

    <key>com.apple.aelwriter</key>

    <true/>

    </dict>

    <key>ProgramArguments</key>

    <array>

    <string>/usr/sbin/AELWriter</string>

    </array>

    <key>RunAtLoad</key>

    <false/>

    <key>UserName</key>

    <string>root</string>

    <key>ThrottleInterval</key>

    <integer>2</integer>

   </dict>

   </plist>

Contents of /Library/LaunchDaemons/com.macpaw.CleanMyMac2.Agent.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.macpaw.CleanMyMac2.Agent</string>

    <key>MachServices</key>

    <dict>

    <key>com.macpaw.CleanMyMac2.Agent</key>

    <true/>

    </dict>

    <key>Program</key>

    <string>/Library/PrivilegedHelperTools/com.macpaw.CleanMyMac2.Agent</string>

    <key>ProgramArguments</key>

    <array>

    <string>/Library/PrivilegedHelperTools/com.macpaw.CleanMyMac2.Agent</string>

    </array>

    <key>ServiceIPC</key>

    <true/>

    <key>Sockets</key>

    <dict>

    <key>MasterSocket</key>

    <dict>

    <key>SockFamily</key>

    <string>Unix</string>

   ...and 10 more line(s)

Contents of /Library/LaunchDaemons/com.microsoft.office.licensing.helper.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>MachServices</key>

    <dict>

    <key>com.microsoft.office.licensing.helper.port</key>

    <true/>

    </dict>

    <key>Label</key>

    <string>com.microsoft.office.licensing.helper</string>

    <key>OnDemand</key>

    <true/>

    <key>ProgramArguments</key>

    <array>

    <string>/Library/PrivilegedHelperTools/com.microsoft.office.licensing.helper</s tring>

    </array>

    <key>ServiceIPC</key>

    <true/>

   </dict>

   </plist>

Contents of /Library/LaunchDaemons/com.rim.BBDaemon.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC -//Apple Computer//DTD PLIST 1.0//EN

   http://www.apple.com/DTDs/PropertyList-1.0.dtd >

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.rim.BBDaemon</string>

    <key>Program</key>

    <string>/Library/Application Support/BlackBerry/BBDaemon</string>

    <key>ProgramArguments</key>

    <array>

    <string>BBDaemon</string>

    </array>

    <key>KeepAlive</key>

    <true/>

    <key>OnDemand</key>

    <false/>

    <key>RunAtLoad</key>

    <true/>

    <key>Sockets</key>

    <dict>

    <key>Listeners</key>

    <dict>

    <key>SockType</key>

    <string>stream</string>

   ...and 8 more line(s)

Contents of /Library/LaunchDaemons/com.trusteer.rooks.rooksd.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.trusteer.rooks.rooksd</string>

    <key>ProgramArguments</key>

    <array>

    <string>/Library/Rapport/bin/rooksd</string>

    </array>

    <key>RunAtLoad</key>

    <true/>

   </dict>

   </plist>

Contents of Library/LaunchAgents/com.adobe.ARM.UUID.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.adobe.ARM.UUID</string>

    <key>ProgramArguments</key>

    <array>

    <string>/Applications/Adobe Reader.app/Contents/MacOS/Updater/Adobe Reader Updater Helper.app/Contents/MacOS/Adobe Reader Updater Helper</string>

    <string>semi-auto</string>

    </array>

    <key>RunAtLoad</key>

    <true/>

    <key>StartInterval</key>

    <integer>12600</integer>

   </dict>

   </plist>

Contents of Library/LaunchAgents/com.google.keystone.agent.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.google.keystone.user.agent</string>

    <key>LimitLoadToSessionType</key>

    <string>Aqua</string>

    <key>ProgramArguments</key>

    <array>

     <string>/Users/USER/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bu ndle/Contents/Resources/GoogleSoftwareUpdateAgent.app/Contents/MacOS/GoogleSoftw areUpdateAgent</string>

     <string>-runMode</string>

     <string>ifneeded</string>

    </array>

    <key>RunAtLoad</key>

    <true/>

    <key>StartInterval</key>

    <integer>3523</integer>

    <key>StandardErrorPath</key>

    <string>/dev/null</string>

    <key>StandardOutPath</key>

    <string>/dev/null</string>

   </dict>

   </plist>

Contents of Library/LaunchAgents/com.macpaw.CleanMyMac.helperTool.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.macpaw.CleanMyMac.helperTool</string>

    <key>OnDemand</key>

    <true/>

    <key>ProgramArguments</key>

    <array>

    <string>/Users/USER/Library/Application Support/CleanMyMac/CleanMyMacHelperTool</string>

    </array>

    <key>RunAtLoad</key>

    <false/>

    <key>WatchPaths</key>

    <array>

    <string>/Users/USER/.Trash</string>

    </array>

   </dict>

   </plist>

Contents of Library/LaunchAgents/com.macpaw.CleanMyMac.trashSizeWatcher.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.macpaw.CleanMyMac.trashSizeWatcher</string>

    <key>OnDemand</key>

    <true/>

    <key>ProgramArguments</key>

    <array>

    <string>/Users/USER/Library/Application Support/CleanMyMac/CleanMyMacHelperTool</string>

    <string>-watchTrashSize</string>

    </array>

    <key>RunAtLoad</key>

    <false/>

    <key>StartInterval</key>

    <integer>21600</integer>

   </dict>

   </plist>

Contents of Library/LaunchAgents/com.macpaw.CleanMyMac.volumeWatcher.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

   <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">

   <plist version="1.0">

   <dict>

    <key>Label</key>

    <string>com.macpaw.CleanMyMac.volumeWatcher</string>

    <key>OnDemand</key>

    <true/>

    <key>ProgramArguments</key>

    <array>

    <string>/Users/USER/Library/Application Support/CleanMyMac/CleanMyMacHelperTool</string>

    <string>-cleanWinJunk</string>

    <string>-cleanTrashes</string>

    <string>-cleanMacOSJunk</string>

    </array>

    <key>RunAtLoad</key>

    <false/>

    <key>StartOnMount</key>

    <true/>

   </dict>

   </plist>

Contents of Library/LaunchAgents/com.macpaw.CleanMyMac2Helper.diskSpaceWatcher.plist (XML  document text)

   <?xml version="1.0" encoding="UTF-8"?>

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Contents of Library/LaunchAgents/com.macpaw.CleanMyMac2Helper.scheduledScan.plist (XML  document text)

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   ...and 2 more line(s)

Contents of Library/LaunchAgents/com.macpaw.CleanMyMac2Helper.trashWatcher.plist (XML  document text)

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Font issues: 15

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Firewall: On

Listeners

   launchd: afpovertcp

   launchd: afpovertcp

   kdc: kerberos

   cupsd: ipp

Wi-Fi

   link auth: wpa-psk

User login items

   Microsoft AU Daemon

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   My eBay Manager

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Widgets

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Restricted files: 882

Elapsed time (s): 341

Did a Yosemite clean install and display problems persist. iMac was completely frozen this morning with artifacts on display. No third party applications installed, only Yosemite. Going back to Mavericks from Time Machine.

I had this same issue a year ago along with many others who have mid 2010 27" iMacs. It was resolved after I paid to get most of my components changed by the apple store (video card twice and then logic board) ever since I installed Yosemite it came back.

Welcome to the club. Here is the older thread with all the other people with the same issues: Red and green square dots?

Update: Partitioned my internal HDD and installed a fresh copy of the public version of 10.10, which I downloaded from the App Store.  Setup my user and in my short usage time this morning, it showed no evidence of the graphics issue I experienced on my other internal drive.  To me, this does indicate a software issue in the upgrade process I followed.  Other users on here have reported this same issue going directly from 10.9.5 to the public release though, so not sure what that means for our models of iMacs.

Next step for me before Genius appt. would be to backup all of my data, wipe my primary SSD, and reinstall a fresh copy of 10.10 and migrate my data back.  I will let you know what happens.

I did a fresh install yesterday afternoon as well without any third party app, only Yosemite and this morning my iMac was completely frozen. Went back to Mavericks and gonna stay with Mavericks until Apple release a fix. Let the screen goes to sleep during the night and check it tomorrow again...

I have had pixilating on my 27" iMac - (mid 2010 model) since day one.  Just thought it was "the way it is".  But since Yosemite upgrade - much worse. Larger blotches of green and pink squares.  Guess a trip to Genius bar - or call is in order.