BleepingComputer.com: No Power But Its Not The Psu

Hey,

Recently my friend blew his power supply, we think its because of old wiring but whatever, it stopped working.

So i got a new power supply, put it in but the system wont do anything! I tested the PSU using a paper clip and a CD drive and it works fine outside the case, but when i put it into the computer and plug in the needed cords nothing happens when you turn it on! (nothing means nothing the cpu fan doesnt even move etc)

What could cause this? Im guessing the mobo is screwed due to whatever killed the first power supply but is there anything else i should check first? or a easy way i can confirm it is the mobo

I made sure that the cables that need to be plugged in were so its not that

Thanks for any help

Assuming everything is plugged in correctly, disconnect the power switch from the motherboard header and short those two pins together momentarily. That will eliminate the switch as a cause. Likely you have a toasted mobo but it never hurts to eliminate the simple stuff.

There is a switch on you power supply. I the good old U.S.A. it should be set too 110v

As for the PSU...the simple test is to put it (temporarily) into a different, known-good system.

The motherboard diagnosis is not so simple .

Louis

A faulty cpu fan will do exactly what you described.