I having a problem with my girlfriends computer. When working in Windows XP or or online, the machine randomly reboots itself. It will turn itself back on for a few seconds and then off again, then back on like it's studdering and then eventually (hopefully) back on again. I think the power supply is the problem. Any other ideas? I just formatted the machine the other day and had it turned on for about two days straight without a problem. Now all of a sudden, it's re-setting itself randomly. The RAM and hard drive are fairly new, so I don't suspect that to be the problem. The only other things in there are a CD-RW drive, modem, video, and a USB expansion card. Any ideas??? CM.