Charlie Skiddi

NOT BAD PSU - I have the same problem on an iMac 2011 27, only led one (1) is on and HDD spinning, nothing else (also power to HDD comes on immediately when plugging power to the computer. But I have another functional iMac exact same year and configurations. Putting the logic board from it in the problematic one and everything boots normally, fans ok, screen okey. That means that PSU, inverter board and all cables are ok, I have changed to a good GPU and new memory sticks on the faulty logic board but same problem and symptoms… So it has to be the logic board that is corrupt and broken… right?