PC will not turn on and no LEDs come on at all. Sometimes, though, this can be a motherboard problem as well.
Computer not booting
A faulty power supply does not supply any power at all to a computer or supplies incorrect voltages. Most of the time faulty power supplies are not serviceable and require replacement.
Either a dead battery - or a faulty power supply.
Voltage settings on the back of the power supply should be checked
You should not bother to check any power supply in the motherboard. You need to take the motherboard to service centre if faulty.
Either faulty power supply or faulty wiring, the latter of which can either be hot or ground.
A dead PC could have no power going to it. The power cable could be faulty or the circuit breaker on the power supply could be flipped. If these conditions all check out, then it is likely a faulty power supply. Try these solutions. If this doesn't work, let us know ;)
when ram becomes infected by the power supply
you should be able to find one for $30 these days.
You need to describe symptoms. Check oscillator frequency and power supply.
Yes get a replacement as it could damage other parts of your system
Need to know what are the symptoms. Give us more info.