I opened a Desktop computer because when I tried turn it on it was completely dead. No LED's or fans.
I tested the power supply and the tester only showed +5 volts was working.
I swapped the power supply with one that I know works and the motherboard fan and Power LED went on for a brief moment but still would not boot.
I checkec that power supply with the tester and again it only show +5 volts.
So I pulled out a third and very good power supply plugged it in and same results.
My new and very good CoolerMaster power supply ended up the same with only +5 volts working.
I am besides myself.
Can a motherboard fry a power supply?