2009 iMac freezes and pixels turn colors

Discussion in 'iMac' started by revolyssup, Apr 27, 2016.

  1. revolyssup macrumors newbie

    Joined:
    Oct 18, 2015
    #1
    I got a 2009 iMac 24" that is having some issues. After a little bit of use (30 mins or so) the screen becomes jumbled, freezes, and some of the pixels turn different colors. Only way to get out of it is to reset the computer. I've attached some pictures for you to see.


    As you can see the screen becomes all messed up
    [​IMG]


    Here you can see where the pixels are turning multiple colors.
    [​IMG]

    Thanks in advance
     
  2. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #2
    It looks like your iMac's GPU is failing. You might be able to avoid the issue by increasing fan speed using smcFanControl or by "baking" the GPU, but the only permanent fix is to replace the GPU.
     
  3. revolyssup thread starter macrumors newbie

    Joined:
    Oct 18, 2015
    #3
    That is what I was thinking. Is this something that I could probably do with the help of a youtube video or something? I do have a bit of experience in building/repairing PC's but never worked on a Mac. Thanks for your help.
     
  4. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #4
    Here is a GPU replacement guide: https://www.ifixit.com/Guide/iMac+Intel+24-Inch+EMC+2267+Graphics+Card+Replacement/13765. Luckily it's removable and not soldered to the board like the 2012+ models, but it is a custom part and very hard to find.
     
  5. revolyssup, Apr 27, 2016
    Last edited: Apr 27, 2016

    revolyssup thread starter macrumors newbie

    Joined:
    Oct 18, 2015
  6. redheeler macrumors 603

    redheeler

    Joined:
    Oct 17, 2014
    #6
  7. havokalien macrumors 6502a

    havokalien

    Joined:
    Apr 27, 2006
    Location:
    Kelso, Wa
    #7
    I have had success in rebaking the original card, adding thermal paste better and using a fan control software to keep the mac cooler than stock on 2009 and 2010 iMacs.
     

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