Most mystical rebooting problem ever

[Leo V]

At some point, my overclocked Opteron 146 system began to experience sporadic loss of power/reboot. At first I didn't care, but the reboots became annoying.

Eventually, this caused me to stop overclocking; then replace the motherboard, memory, CPU, and power supply.

As it turns out, none of this helped. The reboots continue to this day. There never was a blue screen or windows error, so I am assuming software or memory corruption is not likely to be the problem. The reported temperatures are well within norm. The reboots appear quite random and not related to particularly strenuous activity, although they typically only happen when I'm on the computer.

Any guesses?

Opty 146-->144 with huge heatsink+fan
Two different nForce4 mobos
OCZ Gold ES(?) RAM x2 running @2.7V (minimum recommended)
GeForce 7800GT
2 hard disks (ATA + SATA)
DVDRW
One of two 400W PSUs
Old UPS
Firewire soundcard

--Leo

 

[VirtualLarry]

power supply?

 

[montag451]

Could've damaged components when oc'ing.

swap out and good luck

 

[KAZANI]

Having replaced all major computer parts and the PSU, I think it is reasonable to suspect the old UPS. I suggest you remove it for a while and see if the reboots disappear. Perhaps you only need to replace the aged batteries inside the unit.

 

[dbailey]

Random reboots, in my experience are always caused by faulty ram. Run memtest on your NEW ram for a few loops and see if you have any errors.
http://hcidesign.com/memtest/
Good luck!

 

[Leo V]

Well.... What do I know... I followed Kazani's advice and got rid of the APC UPS. (As soon as I did, the UPS started beeping and blinking its lights indignantly, demanding that every part of it be replaced.) Without the UPS, I have not had a single reboot so far, going for 2 days now.

So, it seems like an old UPS can destabilize (and possibly damage) your computer.... who would have guessed!