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Hello I have opened up my imac to see the diagnostic lights i only see three.
anyways i plug in the imac led 1 light comes on.
press the power button 2 light come on with the bright white light.
3rd one does not turn on. And there is no sound can you help
Thanks Steve
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3rd LED means your video card is not communicating with the logic board. See this Answer. The video card can not be replaced or repaired separately, you have to replace the entire logic board. IMHO, I would put the money towards a new computer rather than pay the $300+ to fix/replace the board.
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