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Mystery shutdowns

S

slippygod

Junior Member
My system has been running fine for almost 2 years. I turned it back on after having it off for a month for winter break, and ever since, it sometimes shuts down when I'm away. It mostly happens overnight, but sometimes it happens when I walk away for a few hours. Either way, there doesn't seem to be any pattern. Windows XP doesn't prompt "The system was shut down unexpectedly..." or ask to do a disk check, so I can only assume it shut down properly...
The Windows power settings are set to never shut anything down, and none of the apps I run would shut it down either. I'm running ZoneAlarm and regularly do virus and spyware checks with no problems. I'm running off an APC UPS, and the system app says there have not been any power failures. I don't think anything has changed since before break. I did get a new mouse (MX 1000) but I doubt that could be it. My CPU is overclocked, but I've been running it like that for as long as I've had my PC. Is there anything I can do to figure out why it's shutting down?

Athlon XP 2500+ Barton (oc'ed to 3200+)
Gigabyte K7 Triton mobo
Thermaltake TT-420AD 420W PSU
1gig PC2700 DDR
Sapphire Radeon 9800SE
80gb SATA system drive
400gb PATA RAID
Windows XP


Any help would be appreciated!

(edit to include PSU)
 
is that a 7nnxp? with the Dual Power System? I had a very similar problem and i have a 7nnxp, and the DPS turned out to be the trouble maker, and ever since i ditched it, its been butter. its worth a try at least.
 
Is there any way I can test my PSU? I have a multimeter, among other things. Just don't know how to go about testing a power supply.
 
Neither system, application, or security in Event Viewer show anything useful. Just now I went away at 9 PM to make food and came back in 20 minutes to find it off. Does this make any sense for it to be shutting down when it's idle? The CPU and case temps are normal and well below any alarm level.
 
When was the last time you dusted inside your case? I've had this problem before when the cpu cooler got clogged with dust and the computer would shut down intermittantly (probably to avoid thermal meltdown). Especially if I was putting it under load.

...I just read that CPU and case temps are normal...sorry I have no other explanation..
 
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