red screen tint on 07 20"

Discussion in 'iMac' started by stuartmac, Apr 20, 2014.

  1. stuartmac macrumors newbie

    May 21, 2013
    Saint John NB.
    i recently tried to boot an imac that had been sitting for a while. i know it was working because i packed it away.

    it was completely dead, after a bit of diagnosis i replaced the power supply and it booted right up. After that the screen seams to be stuck in what looked like a low res low color mode but ive changed every setting i could think of.

    i replaced the display with the display out of my parts beast and it had no effect. some things look ok and something things look very wrong.

    I guess that leaves the video card but i dont have one since thats whats wrong with my spare as well. ( common issue apparently )

    Any other suggestions before i order a used video card.
  2. rambo47 macrumors 6502a


    Oct 3, 2010
    Denville, NJ
    Resetting the PMU and re-calibrating your colorsync profile are commonly recommended.

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