Howdy I noticed a similiar post to this question, and I have the exact same problem. http://www.techspot.com/vb/topic44192.html I've had my computer for a few years now and rarely it randomly reboots during a game. But now it is doing very frequently, almost always now, I'm starting to get really worried, I've checked forums, replaced parts, and Guild Wars Nightfall comes out tomorrow! It happens right when I enter Guild Wars and also during Halo (PC) when I start a mission. (I understand that this is the default setting for sys recovery and have reset it) I recently upgraded to a gig of ram and got a new fan because my computer was having some overheating issues. Apparantly the overheating wasn't the issue causing the rebooting, because now my computer runs at a good temp and games/programs cause my system to restart itself. Any suggestions, words of wisdom please? ACPI Uniprocessor PC Intel Pentium 4 1.60 GHz ATI Radeon 9250 Graphics Card CMedia AC97 Audio Device (built in sound) and Legacy Drivers 1 thing to point out is could this be a sound driver issue? The other guys problem was solved through updating his sound drivers. I have no way of knowing considering my computer doesn't give me an error message. Help I'm completely lost.