Computer won't turn on at all. Dead Cpu/Motherboard?
So my parent's computer won't turn on anymore. Originally was thought to be the power supply, so I took out the PSU and tested it with one of my PSU testers and it turned on, and all voltage readings looked spot on.
I tried removing the motherboard from the case to see if it was a grounding issue, still didn't turn on. I disconnected everything but the main power and CPU power, still won't turn on. I tried turning it on without the CPU installed and it still won't turn on.
Will a computer still turn on without a CPU installed? Surely it would at least power up the fans and whatnot if the mobo was working, correct?
I have tried everything short of taking apart the power switch on the case itself but from close inspection that looks fine as well.
Is there any way to know for sure if it is the motherboard that is at fault or cpu?