In the last few days my PC has refused to start.
It's initial behaviour was to repeatedly try to power on until I hit the power switch on the power supply.
It now exhibits one of two behaviours:
- It does nothing at all.
- It briefly powers on before shutting down again.
My initial assumption was that:
- The case power button was broken.
- The power supply had failed.
- The motherboard was dead, possibly as a result of 2.
I used the power/reset buttons from another case with exactly the same results which seems to discount 1.
I bought a power supply tester which initially reports and passes a value of 5.3V on the +5VSB supply rail (I assume it's rounding up) which then jumps to 5.4V and sets the tester beeping.
So the question is would this voltage prevent the PC from starting and is likely to have caused permanent damage to the motherboard?