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  1. #1


    Member Since
    Feb 16, 2009
    Posts
    1
    Unhappy Very Grainy Display
    My old iMac running OSX 10.4.1 has suddenly decided to make the display very "grainy" and I am wondering if this is a problem with the OS or the hardware.

    I tried altering the brightness and contrast but no good.

    When I boot up the pc it looks fine until the wallpaper appears when it is ok for a second or two and then jumps to the grainy display.

    Anyone any ideas.

    Thanks.

  2. #2

    Chilbear's Avatar
    Member Since
    Jun 14, 2007
    Location
    Toronto
    Posts
    574
    Specs:
    2xiMac24 w Parallels 6 (1x White, 1x Aluminum), iPhone 3GS with iOS5
    Update your OS to a later version as the early ones were suspect. Get the latest Combo updater and try that first.

    Sounds like a bad driver as a first guess. What kind of plug is the monitor using - DVI or other? Maybe the video card is going away (overheating?) and defaulting to a lower res. Also go into the Preferences>Displays and make sure what you have for a monitor is correctly identified by the system and it should allow a choice of resolutions in the pull down.

  3. #3

    kahlil88's Avatar
    Member Since
    Jan 29, 2008
    Location
    Mendocino, CA
    Posts
    682
    Specs:
    17" MacBook Pro A1297 2.3 GHz i7 4GB DDR-1333
    Check out your display preferences - make sure it's set to millions of colors instead of thousands, as this will make the picture appear "grainy"
    There is no system but GNU and Linux is one of its kernels.
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  4. #4

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    33,272
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by kahlil88 View Post
    Check out your display preferences - make sure it's set to millions of colors instead of thousands, as this will make the picture appear "grainy"
    Excellent suggestion! I bet this is the problem. The OP's computer is probably set on 256 colors...instead of thousands or millions.

    - Nick

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