My computer has taken a liking to spontaneous reboots recently, not completely random, but random seeming enough.
I recently upgraded my system from a single 2GB stick of RAM to three, totaling 6. When doing this I discovered that while my processor supports 64 bit operating systems, I was still using 32 bit. I repartitioned my hard drive and installed Ubuntu onto a new partition and had some strange errors with booting, it seemed unable to fully boot, but finally everything worked. Then the reboots came...
Seemingly random, the screen would just go blank, and the next thing I knew the bios screen would pop up and attempt POST, although often it would be stuck prompting a press of the reset button.
I also noticed issues with my ethernet card, I thought it was not working (onboard) and put a PCI card in, things worked, so I stopped worrying about it. There is a chance that the cable I was using was bad, but I'm not sure about that.
At first I thought it was the RAM, so I attempted using just the original stick, using 2 sticks, switching out individual sticks, using just one of the new sticks, I kept running into spontaneous reboots.
Next I thought maybe it was the new installation of Linux, so I tried the old version. No go, rebooted. Then I went for Windows, and what do you know, it worked....nope, reboot. Dang, that rules out the OS.
I noticed that it seems to happen when I try playing flash videos on youtube, usually it works, but occasionally I start a video and within seconds the system dies. Curious. I thought perhaps video card, so I borrowed a video card out of another computer, booted, updated drivers, everything worked fine, but it still rebooted as soon as I played a flash video.
I've done hard drive scans, and everything appears to be working correctly, but I don't have a spare to test, so I can't be completely sure on that.
Cooling is fine, I have a very open case with lots of fans, and in the middle of reboots I have checked and everything on the motherboard is well within safe ranges, barely warm most of the time.
So that leaves motherboard, power supply, and CPU right? (*maybe* HDD)
Note, the reboot is a *full system* reboot, just about the same as if you pressed the reset button, but it seems to hang on the bios initialization, usually not actually getting to POST. Black screen > Bios screen > hang >need reset
I'm leaning toward the motherboard since I was having issues with the ethernet, (I think) but without other hardware I don't have any way to test it out. Any thoughts?
RAM: 6GB DDR2 1066 (three sticks)
Hard Drive: 640GB WD SATA
Motherboard: Asasu M4A785
Processor: Athlon II X4 Propus 2.6Ghz
Video: EVGA GeForce 9500 GT 1GB
Power Supply: Cooler Master Silent Pro 700
Primary: Linux - Ubuntu LTS 10.04 64 bit (clean install)
Secondary: (old) Linux - Ubuntu LTS 10.04 32 bit (upgraded from previous version)
Tertiary: (rarely use) Windows XP Professional 32 bit (occasional gaming, boot once every couple of months.
Edited by aximilation, 09 June 2010 - 02:24 PM.