No picture, fans running, possible failure?
I have an iMac 11,2 (A1311) here, after turning on the iMac, there is no picture showing up, no typical Mac chime, Diag LEDs onboard showing LED 1&2 coming up, LED 3/4 is dark. I already changed the video card, same result. Connectors are fine, nothing broken. Unfortunately I think that the LogicBoard is defective, but as a replacement is very expensive, I hope that someone might have another recommendation/ tip?