I have a custom built computer that my BROTHER built and gave to me. I did change the videocard since I got it.. Anyway the problem I am haveing is It suddenly stopped working. I had it running and the sound card came loose from the slot so I took the side panel off and put the sound card back where it goes. Now when I plug it back in and flip the power switch on back the fans automatically COME on and stay on unless I hit the power switch. They used to only run when the computer was on. The biggest problem is now the computer itsself wont come on. Just the fans. I know the fans are connected through the MB so the MB CANT be FRIED. I tried takeing the sound card out thinking maybe it was bad but it still wont boot back up. I tried takeing out every PCI/AGP thing one at a time to see if any where the problem. Still nothing. I CHANGED the MB batterie and still nothing. I have plenty of power from the power supply.

what would cause the fans to be stuck on but the computer itsself not work?