I had an Asus A7N8X rev2 Deluxe, with AMD XP 2600+, 2 x 256mb Corsair TwinX ram, Mylex Ultra2 SCSI RAID card (4 x 9gb HDD's), High Point SATA RAID (4 x 200gb HDD's), Tagan 480w PSU, PCI NIC, Pioneer IDE DVD, Windows 2k. The PC would randomly crash, for no reason, in Windows, loading windows, in the BIOS! As you do, you remove one component at a time, to see where the problem lies. So, now i have a MSI Delta LSR, AMD XP2000+, 2 x Crucial 256mb ram, no RAID, single 6gb IDE HDD, Global Win 350w PSU, no NIC, cheap Cd-Rom, Windows 2k. And i still have the same problem, although now, i can pretty much crash it on demand, by using Prime 95, and using the maximum heat test. It lasts about 3-6 seconds before completely locking the machine up. The only thing i can see, is the fact that the 12v and 3.3v rail drop when i start the Prime 95 test, but i've changed the PSU and i've tried different mains plugs. Anybody, any ideas?