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  1. #1

    Member Since
    Nov 24, 2010
    Question iMac Screen - Flickering w. 24 colors ???

    So I turned on the iMac and it was running fine for about 5-10min when I noticed total loss of color to what looked like 24 colors and flickering... I tried to do the display firmware update 1.0 (I'm running MAC OS X 10.6.2) it gave me some alert that I don't need this update... All software is up to do...

    Any ideas?

    Attached a couple pics...


    Attached Images Attached Images

  2. #2

    Buzzard2010's Avatar
    Member Since
    Oct 22, 2010
    Bretforton, Worcestershire
    MacBook Pro 15" 2014, 2.2GHz i7, 16GB RAM, 250GB SSD, OSX 10.9.5 - iPhone 5s 16gb
    Welcome to Mac-Forums
    Have you tried changing the settings in System Preferences > Displays?
    If so then try reseting PRAM and NVRAM, PRAM contains monitor depth etc.
    Guide on how to do this is here:
    Resetting your Mac's PRAM and NVRAM

    - Simon

    If you have been helped, don't forget to use the Reputation system at the top right of their post.
    May 2011
    Nominated: March 2011 & April 2011

  3. #3

    John T's Avatar
    Member Since
    Nov 06, 2010
    21.5in iMac
    As you were advised in Macrumors, looks like your video card is bad. Apple are the best to advise.

  4. #4

    Member Since
    Nov 24, 2010
    Gpu :(

    I've tried system display settings w/out any success

    Tried resetting the PRAM and NVRAM, no love.

    Next step... Applecare.

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