Hello, I have a problem with my iMac and I hope you guys can help me. Its an 24 iMac Mid 2007* 2.8 Ghz Core 2 Extreme (EMC No.: 2134 Model No.: A1225). The iMac suddenly turned off as if sombody pulled out the powercable. If I press the power button nothing happens as if the machine gets no power at all. So I opened the iMac and removed all the dirt and dust. I thought it might be the PSU but I cant see any optical defects. When I pluged in the powercable the first Diagnostic-LED light up shortly and went off again. When i pull the cord and plug it in again nothing happens... I checked the cable itself and tried another one to be sure its not teh cable. Can I be sure that it is the PSU (because of the LEDs) or could it be the logicboard either? Any Experiences? Thanks for your help. And sorry for my poor english.