Video card or logic board issue
This iMac boots to hard drive and I can connect remotely with screen sharing, I run system profiler and check the Graphics/displays and it shows nothing connected does not show the video card. There is no display, sometimes I get a gray flickering screen and other times I get the black screen, I tried the external output with a dvi to VGA adapter and get no output to the monitor, ( I verified that the ext monitor and adapter operate with my working machine) LED 1 on, LED 2 on, LED 3 on, LED 4 sometimes is on and other times not (???). I reseated the video card and double checked all connections. I am unsure which part has failed on this unit any input is appreciated, and many thanks in advance running OS X 10.6
Is this a good question?