Preface: I bought all the parts for a new PC, assembled, didn't POST or beep. After a few RMAs and more testing, it turns out I had a bad case speaker & a bad stick of RAM. Finally I get the thing up & start installing Windows XP Home w/SP2. Near the end, it says it needs some files from a SP2 disc. The XP CD I have has SP2 included. So anyway, I hit cancel or whatever & let it finish. Once to the desktop, I tried to install my onboard lan/audio drivers, but there were some MS files missing, so I rebooted & repaired Windows, which seemed to fix the problems. Now for the actual problem. I'll be playing a game, and at some point, the PC restarts on me or just hangs with a black screen. Sometimes it gives me a STOP error, sometimes not. I've tried so many different things, I couldn't tell you if it was after a new driver or what. Also, here are things I've tried: -Made sure all drivers & BIOS were up to date -Different video drivers(beta & from other sites) -Different audio drivers(Realtek & ECS chipset) -Different video card(Geforce 7900GS -> Radeon x1600 Pro) -Installed an old PCI-128 Sound Blaster card & disabled onboard. -AMD Dual Core Optimizer -Windows Hotfix for dual-core CPUs -Changed affinity for the game's process (so it's only using 1 cpu). This has to be done every time, but after crashing still, I haven't bothered doing it again. I've attached a dxdiag report and the 3 minidumps I've gotten so far, as well as a screenshot using SpeedFan. I'll go back to playing & see if it gives me another STOP error. Just crashed in-game again (screen went black) & had to hit the reset button. No STOP error, so it's possible the minidumps I posted are irrelevant at this point. The CPU temp in BIOS was @ 47c & the MB was @ 32c (with case closed). I'm not sure what the 120c & 80c readings are in SpeedFan, but certainly if anything was that hot, I'd smell something Btw, should this be in a different forum?