My iMac does not start

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 Where can I find the diagnostic LEDs on first iMac Intel?. 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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