Won't Power On - Even after power supply replacement
I have swapped the power supply on this iMac with one bought from iFixit. It still will not power on. No fans move, no LEDs on the mainboard.
I have checked the input voltage to the power supply and confirmed 118v at board headers. I also measured the output of the power supply and confirmed 3.8 and 12v rails give voltage. The computer still will not power on.
Should I immediately suspect a bad mainboard, or is it possible for the power button to fail? Where is the header for the power button so I can short it manually?
I found the power header and tried shorting it...still no luck
I also tried swapping RAM
Is this a good question?