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  1. #1


    Member Since
    Jun 18, 2012
    Posts
    5
    Unhappy iMac screen goes black - have to power down
    Sorry, I know this comes up in all the forums but I'm not finding answers. While I'm using my Mac the screen goes black. I have to power down [control-opt-command + power button], wait, & power on again. It's becoming more frequent. I'm becoming more anxious. Thanks.

    iMac early 2008
    2.66 GHz Intel Core 2 Duo
    6 GB 800 Mhz DDR2 SDRAM
    ATI Radion HD 2600 Pro 256 MB
    OS X 10.8.2

  2. #2

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,761
    Specs:
    Imac 27", i7 3.5GHz, 3TB Fusion drive, 32GB memory, macOS Sierra.
    Sounds like the backlight is failing. In this thread from Apple Discussions, go to the ifixit link:-

    https://discussions.apple.com/thread...art=0&tstart=0
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3


    Member Since
    Jun 18, 2012
    Posts
    5
    More info on the problem
    Thanks, but maybe I didn't include enough info. In its early stages, the screen would suddenly go black...or vertical red stripes or yellow or occasionally gray. I upgraded to 6GB memory (as recommended somewhere online) & I've had no more colored versions. The sudden black continues. A repair shop told me it's the logic board, and I truly can't afford to replace that. Does this history make a difference? I ask because the thread you referred me to addresses dimming rather than black-outs.

  4. #4

    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
    Posts
    22,761
    Specs:
    Imac 27", i7 3.5GHz, 3TB Fusion drive, 32GB memory, macOS Sierra.
    You may be correct in logic board. Suggest not worth spending big bucks on now five years old.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  5. #5

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Keller, Texas
    Posts
    50,175
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, Sierra
    I agree in that it sounds like the graphics processor on the logic board is failing or intermittent. And since the GPU is soldered to the logic board it means replacement of the entire board. Not worth repairing on a machine that old.

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