I get a completely random reboot that seems unrelated to any specific activity on the computer. It happens at random times. It occurs infrequently (2 or 3 times a month). I replaced my power supply...problem still occurs. I ran MemTest86 and the Windows Memory Tester for many hours (11 passes) and ram checks out okay. I have a brand new hard drive in there and ran chkdsk. It is fine. I don't think it's a heat issue b/c it happens so randomly and my computer will work fine under heavy load. I've turned off "automatic restart" so I could get the stop error on the blue screen. Here are the three different stop errors I have recieved in my event log pertaining to the random reboot: The computer has rebooted from a bugcheck. The bugcheck was: 0x1000007f (0x0000000f, 0x00000000, 0x00000000, 0x00000000) The computer has rebooted from a bugcheck. The bugcheck was: 0x10000012 (0x00000001, 0x00000200, 0x00000000, 0x00000000). The computer has rebooted from a bugcheck. The bugcheck was: 0x1000008e (0xc0000005, 0xbf0bc597, 0xf0cf7468, 0x00000000) Any ideas what my next troubleshooting step should be? This problem is really annoying. Any help would be greatly appreciated.