The iMac is Apple's line of all-in-one desktop computers.

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Three LEDs on hard drive and fans turn. No video or chime.

I've got an iMac and three of the four lights come on. I can hear fans and hard drive start up, but no video. I can't get external video and I was wondering what I could do. Logic board, video card?

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No external video points to Faulty iMac - Only three LEDs appearing in diagnotics? or logic board. On most of these models the video card is integrated to the logic board.

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