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  • ronaldy Level 1 Level 1 (0 points)

    I seem to be having video corruption that has not been described/reported on this thread before...


    Very often after waking-up from stand-by or unplugging from my external 20" LCD monitor, I will get corruption display (like below) everytime I used the command-tab key yo switch between apps.


    Screen Shot 2011-12-13 at 4.00.27 PM.jpg


    Anyone know of a fix??



  • Syferix Level 1 Level 1 (0 points)

    I've been having strange issues with my iMac too.


    27" iMac, Mid 2011 edition, 3.4 i7, 16GB RAM, AMD Radeon HD 6970M with 1024MB ram. 10.7.2


    I have a Macbook Pro as well, and used migration assistant to transfer over my files. All seemed good for about a week. Then upon waking from sleep or rebooting, I'd get strange graphical glitches and programs continiously crashing. The glitches ranged from garbled pixels on menu bars, garbled pixels on the desktop and even one time where the desktop would blink between a grey screen and the image I had selected.


    Verifying the disk showed that there was a problem with the drive bitmap, and I had to reformat and install all over again.


    Again, for about a week things were fine and then the problems started up again. A call to Applecare and I reinstalled Lion without deleting my info.


    Rinse and repeat, it seemed fine for a week until I got strange graphical glitches again and none of my programs besides the apple ones (safari, itunes, ical) would open, just crashing repeatedly. I re-downloaded Chrome and was able to run it from the DMG and after a reinstall on the hard drive, but a restart made both of these options crash.


    I've done hardware tests and everything turns out fine, verified the disk and it's a'ok. Tested the ram with rember and that's fine too. Even ran S.M.A.R.T. and the drive checks out. I made a new user account but the problems with crashing applications persisted.


    Now I'm on a fresh install of Lion and just waiting for something to happen. I'm still unsure if it's some sort of software glitch or if it's the hardware. Any ideas?



  • Syferix Level 1 Level 1 (0 points)

    Went through testing my RAM. When I put in the two RAM chips that came withh my computer, everything worked fine. I then tried to add two of the other RAM chips I got and things worked fine. ditto with the other two.


    However when I put in all four of the other RAM chips, I started getting the crashes and errors. I'm in the process of getting the RAM replaced and will notify everyone of the results.

  • MusioMan Level 1 Level 1 (0 points)

    let us know what you find!


    RE this RAM issue, NOTHING was wrong in SL but it is in lion so i'm having trouble thinking that it's the RAM..


    badly coded nvidia drivers in lion is the only thing i can think of. If i leave the computer, it's fine for hours and hours...

    when browsing (taxing the cpu), i'll get a glitch at some point. Sometimes it's within 5mins, sometimes 5h


    Here's of of my many, many, many crash logs on the Nvidia GT 120 256MB




    ri Dec 9 12:28:18 2011
    panic(cpu 1 caller 0xffffff7f8092a04f): NVRM[0/2:0:0]: Read Error 0x0061002c: CFG 0x2927ffbc 0x02133c82 0x00000000, BAR0 0xd2000000 0xffffff80f2efd000 0x096a80a1, D0, P3/4
    Backtrace (CPU 1), Frame : Return Address
    0xffffff80f2debc80 : 0xffffff8000220702
    0xffffff80f2debd00 : 0xffffff7f8092a04f
    0xffffff80f2debd90 : 0xffffff7f80a1a13c
    0xffffff80f2debde0 : 0xffffff7f80c1d534
    0xffffff80f2debe00 : 0xffffff7f809e2d7b
    0xffffff80f2debe20 : 0xffffff7f80a8b0b6
    0xffffff80f2debe90 : 0xffffff7f80916f1e
    0xffffff80f2debf40 : 0xffffff7f808d0b86
    0xffffff80f2debf70 : 0xffffff800023db2c
    0xffffff80f2debfb0 : 0xffffff8000820057
    Kernel Extensions in backtrace:[3B24E838-5E73-362B-97FA-239F5AEE7D81]@0xffffff7f808c 9000->0xffffff7f80ba2fff
    dependency:[6D54F06A-46B7-37FC-AF22-DE68DC18A1A3]@0xffff ff7f80845000
    dependency:[6517D9A6-58F5-3CFC-B021-C882306150D5]@0xff ffff7f808b7000
    dependency:[55FF26D3-292D-3B4B-8AB7-1D25C8B4313B]@0 xffffff7f8087f000[2E84958C-1EEC-316B-9F7A-68C368F83476]@0xffffff7f 80ba3000->0xffffff7f80ec4fff
    dependency:[3B24E838-5E73-362B-97FA-239F5AEE7D81]@0xffffff7f808 c9000


    BSD process name corresponding to current thread: kernel_task


    Mac OS version:


    Kernel version:
    Darwin Kernel Version 11.2.0: Tue Aug 9 20:54:00 PDT 2011; root:xnu-1699.24.8~1/RELEASE_X86_64
    Kernel UUID: 59275DFA-10C0-30B3-9E26-F7B5DFB1A432
    System model name: iMac9,1 (Mac-F2218FA9)

  • MusioMan Level 1 Level 1 (0 points)

    I've had no problems yet for the past two days. This is what i've tried



    hold CMD and R before the chimes when you start

    go to terminal type resetpassowrd

    click your drive and repair persmissoins (this is a hidden way alterative way in lion which is better than the regular way)


    2: reduce all your tabs in safari and keep to a mimium. Reset safari (too many graphic switching.) Also reset safari in the menu clearing everything


    3: Strangly, this has helped the most; don't use a desktop background. Keep a solid colour. This has seemed to keep my system most stable.



    I'll let you know if i'm still getting crashes...

  • Syferix Level 1 Level 1 (0 points)

    I still have more testing to do, but it appears that changing the RAM has worked for me.


    Before, on the old RAM, I could replicate crashes by keeping applications open and restarting the computer. Somehow, when Lion tried to restore the applications apon restarting, they would crash and refuse to open. Closing all the apps before restarting made sure things could open properly.


    Now, with the new RAM things can restore fine and I've yet to see any strange graphic artifacts.


    If you have installed 3rd party RAM, please check this first. I've done hardware tests and it still checked out fine on the bad RAM so even if hardware tests check out, please consider getting replacement RAM (most has lifetime warranty so getting new chips shouldn't be too difficult).

  • MusioMan Level 1 Level 1 (0 points)

    Syferix, how has your testing gone? Any crashes? If ram tests ok i'm not sure crucial (where i got mine) will exchange it as it costs them money to restock the ram if it checks out ok.. They will just blame the OS.


    I did in fact, install some ram but it was all fine with SL...which leads me to belive it's lion. Literally, never one panic or graphics glitch with SL. Lion it's daily


    Unfrotuantly, i'm still having problems. My post above did help a lot and i nearly got a week out of it running ok before a graphics glitch.


    I'm hoping they fix this in 10.7.3 as it seems as others in prevoius posts fixed it by hacking around the system..

  • Syferix Level 1 Level 1 (0 points)

    So far so good. I'll be sure to post here if any issues pop up, but as of now, it's A'ok!


    Most RAM comes with a lifetime warranty. I got mine at OWC and they replaced it quickly and easily - even paying for return shipping back to them. I would double check before throwing in the towel or if you have your factory installed RAM, try putting it back in and seeing if it fixes the problems.


    Good luck!

  • MusioMan Level 1 Level 1 (0 points)

    Glad to hear your system is ok so far Syferix.


    Just to add to this thread, I had some downtime so got a game off the appstore and I've put in a good few hours. All of this graphical power being used....and my iMac is fine!


    Browsing with safari, crashes galore... I have a feeling it's lion although i might try to play with my ram

  • Anke Level 1 Level 1 (5 points)

    Just installed brand new RAM chips in my iMac and still getting graphics glitches and freezing. It has gotten to the point where I just leave my iMac off because I know it won't last long when in use.


    I do get the odd graphical glitch when the scrolling bounces at the top/bottom of the screen. Anyone else get these?

  • chmoss Level 1 Level 1 (0 points)

    My artefacts look like yours. They go away if I immediately do a safe reboot, followed by a normal reboot. I think that process clears a bunch of caches. I have not had any problem for a few days now. I am beginning to believe that the artefacts may be Safari induced. I have been in the process of switching to Chrome, and have not used Safari for a few days - and I don't want to try right now. I have files abug rteport.

  • Anke Level 1 Level 1 (5 points)

    My last two crashes happened today both with using Exposé. The last time it happened I took a screenshot but it wasn't what I was seeing on the screen. It's as if what was on the screen wasn't what the OS was showing. Very odd.


    Please Apple, please fix this, I can't use my machine

  • MusioMan Level 1 Level 1 (0 points)

    chmoss- you may be onto somethinhg..


    In my old uncrashable SL machine, i used Firefox. Maybe Lion (according to Anke?) or Safari is utalizing a draw feature ont the card which it can't cope with.


    Whatever it is, I hope Apple fix this..

  • ronaldy Level 1 Level 1 (0 points)

    after weeks of trying all kinds of suggestions (none worked), i reimaged and restored from a timemachine backup. happy to say that seems to fix the problem... no more video artifacts.


    thanks all...




  • depp086 Level 1 Level 1 (0 points)

    I had artifacts like here :


    Properly I found a solution. Try this :


    It seems it has something to do with the applegraphicspowermanagement.kext. I renamed the file and no more glitches appear. Properly the battery life will decrease because the file handle it.

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