so i just opened an imac that doesnt give any sign of live (blackscreen) the diagnostic led 1 is on as soon as i plug in the power cable also i can hear the HDD turning on when the power cable is plugged in, i can turn the hdd on and off by pressing the power button for 3 seconds but everything else seems to be off (fans not running) also LED 2 stays off, when i plug in display also only LED 1 is on everything else is off, do you think the power supply is not giving enough energy for every part? or do you think its a logic board problem?
