dell dimension 3100 problem.

[kev182cup]

Basically it keeps turning itself on and off sometimes really quickly. when it does get to the home screen the numbered lights that are illumenated are 123. have i picked up a virus or has something broke on it? any pc wizz on here that knows what it could be?cheers kev.

 

[kev182cup]

If anyone is interested i think ive sorted this now, never touched a pc insides before but after buying a new power supply it was still the same so i tried unplugging stuff and think ive pinned it down to a faulty usb port, computer works fine now.