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  1. #1


    Member Since
    Nov 28, 2009
    Posts
    9
    Question Pure blacks appearing red/dark red on iMac 21.5" late 2009 model. Help needed please!
    Hi,

    As the title explains, the pure black areas on my iMac screen have all of a sudden become a dark red, almost maroon colour. It happens on all parts of the screen and is very uniform, i.e there are no particular areas it affects and there are no dead pixels, it just displays pure black as dark red now....all the other colours are fine.

    This occurs when viewing pictures and also videos, basically all the time, but as i said, all the other colours are fine, no dead pixels....it just wont display pure black properly!

    Any help with this would be much appreciated, i am certainly not going to pay a repair man a ridiculous amount of money to fix what may be a simple problem as i'm not adverse to taking computers apart and playing around with them, but any advice on what i am looking for would be great.

    Perhaps a loose connection somewhere? I haven't got my installation disk with me either so can't run a hardware check....is there any way of doing this without the disk?

    Thanks loads for any help you can give,

    Paul

    I've just had a look at a few videos and actually the problem is worse than i thought. The blacks are all red, but there are also flickering red lines around outlines when i zoom into a moving image

  2. #2


    Member Since
    Jul 18, 2012
    Posts
    15
    Specs:
    Power Macintosh G4 Not currently working, so i'm using a Windows 7 Quad Core
    Take a Screenshot whenever you see a red/black spot or line, or anything out of the ordinary, then examine it on another computer. If they appear in the screenshot, it's a graphics or Hard drive/OS problem. If it doesn't, it's a LED screen problem, and take it to an Apple Store.

  3. #3


    Member Since
    Nov 28, 2009
    Posts
    9
    Quote Originally Posted by madboi9o2 View Post
    Take a Screenshot whenever you see a red/black spot or line, or anything out of the ordinary, then examine it on another computer. If they appear in the screenshot, it's a graphics or Hard drive/OS problem. If it doesn't, it's a LED screen problem, and take it to an Apple Store.
    That makes sense, thanks i'll do that asap

  4. #4


    Member Since
    Jul 18, 2012
    Posts
    15
    Specs:
    Power Macintosh G4 Not currently working, so i'm using a Windows 7 Quad Core
    If it was a Mac Mini or a Mac book or something that doesn't have a built-in 60.72 Type LCD screen, it would be easy to replace. But because it is a Type 60.72 screen, it requires an Apple Store Technician to replace that. If it's a Graphics problem, I would buy a new graphics card from Apple and give that AND the iMac to Apple to install.

  5. #5

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,793
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    If it's a Graphics problem, I would buy a new graphics card from Apple and give that AND the iMac to Apple to install.
    The graphics card on his iMac is surface mounted to the logic board and can not be replaced without replacing the entire logic board. A very expensive repair if the machine is not covered by Apple care.

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