GaBeech

Q: Late 2006 iMac, Lines, Kernel Panic, Freeze, Reboot, Restart, Serial W8 ?

Hello,

Let me start by explaining the method I am initially going to adopt in my search for answers;

•All of the keywords and more that would not fit in the title space, relate to my problem.
•I think the *iMac Serial* holds the key to mine and possibly a lot of other peoples search for answers.
•My second post will explain what I know about the Serial and the information it provides.
•I have a strong feeling that a lot of people who have the same or similar problems to me will have a Serial that begins with at least W8.
•I believe that a lot of affected machines will of been produced between 2006 & 2008, yet not confined to that window in time.
•So, to round up, I am looking for people who have had/are having the same/similar problems to the ones listed below.

•Small graphical glitches; Thin lines in random areas on the desktop, growing in number and intensity over time.
•Graphical glitches on, in and around Finder windows. Again, growing in number and intensity over time.
•Horizontal lines across entire screen. Again, growing in number and intensity over time.
•The odd Software Crash/System Freeze. (Which does not happen very often on the iMac we've grown to love)
•More frequent Software Crashes/System Freeze's. (Maybe it's all that freeware and plugins I've been playing with)
•Kernel Panic's, never had one before... it was a new one on me.
•Frequent Kernel Panics.
•System Freeze, recovering after being put to sleep and then woken.
•System Freeze, unrecoverable. Hard reset required.
•Exactly the same behavior after a full reinstall of OSX.
•Exactly the same behavior after wiping system drive with zero's, then a full reinstall of OSX.
•Exactly the same behavior after wiping system drive with zero's, then a full reinstall with a previous version of OSX.
•System Freeze requiring hard reset on nearly every occasion Time Machine was accessed.
•Shut iMac down completely, never to respond to Power Button being pressed again, even after trying to reset the SMC.


The above is a simplified list of key events on a relatively short journey from Perfect Machine to, 'will not power up'.


If you or anyone you know has gone through anything similar, I would love you to join this topic.

Yours,
GaBeech

iMac (20-inch Late 2006) 2.16 GHz Intel Core 2 Duo ~ x1600 Graphics, Mac OS X (10.6.3), Serial Number: W87070ACVUV (Check My Biography To See What A Serial Means)

Posted on May 26, 2010 8:36 PM

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Q: Late 2006 iMac, Lines, Kernel Panic, Freeze, Reboot, Restart, Serial W8 ?

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  • by Richard Lawton,

    Richard Lawton Richard Lawton Sep 10, 2010 8:19 AM in response to pbcubed
    Level 1 (0 points)
    Sep 10, 2010 8:19 AM in response to pbcubed
    Well,
    Here is my update. They replaced the logic board 2 times and forgot to connect the DVD drive.
    It seemed like the new logic board had corrected the problem the first 2 days and then it all started back again. I have another repair appointment. I don't think Apple completely understands what is causing this problem. I will post another update when I get it back from rpair.
  • by R C-R,

    R C-R R C-R Sep 10, 2010 8:13 PM in response to Richard Reid1
    Level 6 (17,700 points)
    Sep 10, 2010 8:13 PM in response to Richard Reid1
    TechTool Deluxe does not test for all the same things Apple Hardware Test does -- AHT is basically a tiny little OS optimized to test the fundamental hardware of the system while relying on as little of it as possible. That is why you must boot into it to use it. It is not an application in the conventional sense.

    I can't say if it will find anything that TTD won't, but if you have not run it, it is worth doing so.
  • by odedia,

    odedia odedia Sep 11, 2010 4:35 AM in response to R C-R
    Level 1 (5 points)
    Sep 11, 2010 4:35 AM in response to R C-R
    I really wanted to run this test but i couldn't find the original disc that came with my iMac. For some reason apple won't let you redownload this tool. The download site lists some
    iBook models and other 2002-2003 models, but not a 2006 iMac.
  • by Richard Reid1,

    Richard Reid1 Richard Reid1 Sep 11, 2010 11:04 AM in response to R C-R
    Level 1 (67 points)
    Desktops
    Sep 11, 2010 11:04 AM in response to R C-R
    Thanks RC-R.

    I don't have the disc with AHT and unfortunately a version for Intel iMacs is not available for downloading, at least not on Apple Support.
  • by R C-R,

    R C-R R C-R Sep 12, 2010 10:09 PM in response to Richard Reid1
    Level 6 (17,700 points)
    Sep 12, 2010 10:09 PM in response to Richard Reid1
    AHT is not available for download because it is model-specific & not an application or system extension. It is a tiny, stand alone OS. This is one reason you need to keep your original grey system disc set available -- you can only run AHT from the system disc, or for recent iMac models reinstall it on a special hidden partition on the startup drive during a complete restore of the HD to factory new conditions if that hidden partition is removed.

    You can usually order a replacement disc set directly from Apple. The cost is reasonable, about $30 from what I understand from users that have done this.
  • by Dis-illusioned,

    Dis-illusioned Dis-illusioned Sep 13, 2010 10:09 AM in response to GaBeech
    Level 1 (0 points)
    Sep 13, 2010 10:09 AM in response to GaBeech
    Please add my name to your list. I just purchased this second-hand beautiful piece of equipment at auction on Sep. 2, 2010. Warranty expiry date: Sep 5, 2010. I have other Apple products that I have never had problems with (MacBook Pro, Airport Extreme), and therefore was unworried about the short timeframe to warranty expiry. The iMac has presented me with nothing but problems from the get-go, i.e. over-heating, kernel panics, pixelation in various forms, and freezes. I started to research the symptoms via my MacBook Pro and discovered your discussion forum. In the 12 days since my seemingly unwise purchase, I have attempted every conceivable recovery option. The problems were initially sporadic, but have grown worse to the point where I can not power up successfully today (yesterday, after a fresh Leopard install, it worked perfectly for 2 and one-half hours w/o a single glitch!!!). Today, through a screen-wide set of pixelated vertical columns that present immediately on repeated startups, I ran AHT from Install Disk 1 - "no troubles were found".

    I guess "Buyer Beware" applies here. I will be following all posts hoping that someone identifies a solution. If I stumble upon one myself, I will definitely share. Good luck to all.
  • by patterscw,

    patterscw patterscw Sep 22, 2010 6:13 PM in response to GaBeech
    Level 1 (0 points)
    Sep 22, 2010 6:13 PM in response to GaBeech
    Add me to the list, applecare is expired, I get the horizontal multicolored pixel lines in windows and on my desktop as well as random freezes with the color-wheel. s/n is W8704... series and its a 20" late 2006 model Imac.

    Message was edited by: patterscw
  • by Stluciegal,

    Stluciegal Stluciegal Sep 25, 2010 4:50 PM in response to patterscw
    Level 1 (0 points)
    Sep 25, 2010 4:50 PM in response to patterscw
    Add me..I have all the issues listed. my lb and hd was changed last week by apple and the problem still persists. I have freezes while using the internet or games and can only reboot. my serial no also has an 8 so I think its a problem with that series.
  • by R C-R,

    R C-R R C-R Sep 25, 2010 7:03 PM in response to Stluciegal
    Level 6 (17,700 points)
    Sep 25, 2010 7:03 PM in response to Stluciegal
    Stluciegal wrote:
    My serial no also has an 8 so I think its a problem with that series.


    Just having an 8 in the serial number doesn't say anything about the model or vintage. Earlier in this topic you will find info about how to interpret the S/N to get its place & date of manufacture info. A leading "W8" in the S/N identifies its place of manufacture, nothing more.
  • by UltimateCole,

    UltimateCole UltimateCole Sep 27, 2010 9:44 PM in response to GaBeech
    Level 1 (0 points)
    Sep 27, 2010 9:44 PM in response to GaBeech
    The exact same thing is happening to me. My old '06 mac started simply crashing when I was using Firefox to listen to Pandora. I would just hard-off it and move on. At first it would happen once a week, but then it got more and more frequent, as well as worse. Now it's happening 3-4 times a day, including random red-tinted areas of the screen and 'static-y' areas. It's gotten so bad that the System Profiler starts to freeze occasionally. I am prepared to provide a picture as evidence: http://img801.imageshack.us/img801/6420/0927001915.jpg

    Please help me. Any advice would be appreciated.
  • by Gorden,

    Gorden Gorden Sep 27, 2010 11:57 PM in response to UltimateCole
    Level 1 (0 points)
    Sep 27, 2010 11:57 PM in response to UltimateCole
    Same boat as you and many other people here. Disabling quartz and maybe spotlight may lower the strain put on the GPU with normal use, excluding watching (HD?) videos or gaming. It helped me out slightly when the graphic artifacts were getting intense even with light activity or right when booting up/waking.

    On another note, it seems like a problem with the Mac Pros ATI X1900 series are being addressed as noted here: http://www.macrumors.com/2010/09/27/apple-finally-acknowledges-and-addresses-ati -x1900-xt-issue/

    Maybe this is good news for us?
  • by cartoonist81,

    cartoonist81 cartoonist81 Sep 28, 2010 7:06 PM in response to GaBeech
    Level 1 (0 points)
    Sep 28, 2010 7:06 PM in response to GaBeech
    I've been having the same problem, until yesterday I installed "smcfan control". The problem that causes your imac to crash and to display those fuzzy lines is overheating. By using this program your imac will be finally back to normal!

    download: http://www.eidac.de/

    Good Luck!

    Message was edited by: cartoonist81
  • by UltimateCole,

    UltimateCole UltimateCole Sep 28, 2010 8:03 PM in response to cartoonist81
    Level 1 (0 points)
    Sep 28, 2010 8:03 PM in response to cartoonist81
    No, overheating is definitely not it. The mac's internal sensors display that no component is anywhere above a 'comfortable' 90˚ fahrenheit. HOWEVER, the Graphics Control Processor is at a curious 123.8˚F, even though I just barely turned it on. Do you suppose this could be the problem?
  • by macswe,

    macswe macswe Sep 28, 2010 8:36 PM in response to UltimateCole
    Level 1 (8 points)
    Mac OS X
    Sep 28, 2010 8:36 PM in response to UltimateCole
    The graphics processor is clearly the culprit in this issue, but whether the heat is a cause of the failure or just a co-symptom of whatever the underlying failure is, is not discernible from what we know.
  • by UltimateCole,

    UltimateCole UltimateCole Sep 28, 2010 9:10 PM in response to macswe
    Level 1 (0 points)
    Sep 28, 2010 9:10 PM in response to macswe
    Yes, it clearly is. Now that I think back on every time it crashed, I realize that the mouse and everything still worked while frozen. In fact, it would still carry out its "Log out after 15 minutes" programming (Under which circumstance it would resume working from the log-on menu, though not allowing me to log back on). I guess this means it was just the graphics that were frozen. Huh. Well, I guess I'm one step closer to fixing it, though I think that heating is the cause. Maybe smcfan would help?

    EDIT: Ah, wait. Does the GPU have a fan? Otherwise, I don't think the CPU/HDD fans would help at all.

    Message was edited by: UltimateCole
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