A couple of week ago my PC was working fine. Now it won’t start...not even a fan. I thought it might be the power supply, so I changed it out with another one. Nope, not the power supply. I thought it might be the switch on the case, so I connected a new case's switch. Nope, not the switch. I really don't want to change out the motherboard unless I know for sure that it's the problem. Any help is appreciated. The motherboard is an Asus P4B533, P4 2.4 processor.