Chosen Solution
After installing a new power supply, my screen boots up very black but there is a faint desktop image. Did my LCD get ruined somehow? The logic board shows all 3 LEDs lit up. But the connector on the board for the inverter is a bit wobbly. I will have rebuilt the whole computer if I have to buy a new LCD screen! Any tips?
Try to improve the inverter connection as that is probably where your trouble lies. I am including a link to Apples troubshooting guide for iMacs. Ralph http://support.apple.com/kb/TS2094
