NEED HELP! MOBO that kills PSU's??

[IR1]

Ok last night I am helping my little bro put my Geforce 3 ti500 in his computer.

His computer was fine before. So he was playing bf1942 a while then he said his computer just shutoff. And would not turn back on.

I figured he fried his PS, so I took it out tested it and yes it was fried. So I stuck an extra PS I had in his case. And we fired up the machine to a funky *** noise. Now I know this PS was working, but after puting it in his computer its GONE.

Ok time to try PS #3. Some old 200 watt one. I tested it worked fine outside computer. When I plug it into the mobo I hear a loud high frequency whine. I quickly unpluged it outa the mobo tested it and it was still working.

So I think his motherboard has fried itself. It was my old trusty ECS K7S5A, nothing expensive. His cpu was an Athlon 1.2. I hope thats not fried.

But does anyone know what happened? The computer was awfully hot after the initial breakdown. I dont wanna fry more than 2 psu's in a 2 day period.

I could use some advice. Thanks

 

[IR1]

Ok whoa wait a minute I just retested the 2nd PSU and now it works? Weird. I am gonna try it again. Maybe it was a short on the case.

but any other ideas would be greatly appreciated.

 

[Lt. Max]

too weak a psu? what psu was the 1st one and the 2nd one..

max

 

[IR1]

1st one was 300 watt, 2nd was 300 watt.

But its ok... its fixed now. I booted the computer up with the powersupply outside of the case. It was shorting out, and was just a coincidence and had nothing to do with what happened to the 1st psu.

Guess I just jumped the gun on the fried mobo theory. I should have known it was just a short.