I've been wrestling with my one remaining Windows XP system (3GHz P4, GeForce Ti4900, SATA, etc gaming PC) for the past few days due to a looping reboot problem. Basically, it tries to start Windows then flashes a bluescreen for half a second and reboots. Over and over again.
Doing a Safe Mode with Command Prompt leads one to believe it's a problem with AGP440.SYS but that's just the last thing that loads during bootup. The actual problem ended up being hardware, not software. Specifically, a failing power supply in an old ATX case.
Anyhoo, after much wrestling with it I found a temporary solution:

As you can see from the temperature monitor / fan controller sitting on top of the hard drive, it's running at about 82 degrees. The temperature probe is stuck inside the heatsink, so that's a good temp for a p4. Being in the open air helps a lot of course... this system normally ran about 100-105 in the case.
Found a nice (quiet) case to replace this with, the Antec Sonata. It's designed as a very quiet enclosure, while still being able to handle the heat output of a 3GHz P4. Not too bad looking either, but not sexy like the G5 or PowerBook. =) Antec are well known for their solid designs, and especially for their high quality power supplies, so hopefully this will fix my issues.
