回答“iMac won`t power on. Power button pressed = LED # 2 lights up briefly”Sorry to open up an old thread but any ideas to my issue. Firstly LED 1 would flash up and go off when power pressed. Suspected power supply, replaced but no difference . Sent PSU back. Ordered logic board. Logic board fitted and now when power lead plugged in LED 1 flashes and when I press the power button it flashes quicker…. I am now VERY confused. Could it be PSU AND Logic board failed?