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After new PSU and rebuilt logic board screen won't light up

by BLDun / November 27, 2009 5:53 AM PST

I have a 17" iMac G5 non-eisight. It's one of the white ones. I had all the caps replaced and the board checked out. They said it checked out OK and I purchased a new power supply. When I reassembled everything and pushed the power button I got the chime and I can hear everything starting up except the screen. I ran a diagnostic and the third green light is not coming on as it should to show the logic board and screen are communicating. Could I have left a wire off? There a lot of plugins on that logic board. Which plugin communicates with the screen?
Thanks for your help

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