Windows 7 desktop randomly shutting down

August 28, 2010 at 22:28:02
Specs: Windows 7
Hey all

So for the past week my computer has been randomly shutting down on me, it could take 10 minutes after the log in screen or 6 hours. I disabled automatic restart on system error in my computer settings in hopes of getting a BSOD to see exactly whats wrong, but it never shows it. It just shows the normal windows is restarting screen. Im 99% sure its not temperature related, I have a antec 900 two case with great airflow and a noctua nh-u12p cpu cooler. I idle at around 38c and load at about 50c. My GPU idles at 40c and 70c while in game, normal temperatures for a hd 5870. Everything is at stock voltages and speeds.

I tried memtestx86 and ran it for an hour with no errors, I unplugged and replugged all psu to motherboard connections. I resat my RAM, video card and soundcard. I made sure my psu to electrical output cable was securely inserted. Finally I repaired windows and im still getting this problem.

Anyway I think its my psu, but unfourtunately I dont have any extra computer parts around, nor another computer that I can swap parts with. Is there anything else I can check before I try to RMA my power supply which may or may not be the culprit? Thanks

Specs: asus p6x58d-premium
sapphire hd radeon 5870 vapor-x edition
corsair dominator 6gb 1600 DDR3
Auzentech Bravura soundcard
corsair tx850watt psu
core i7 920 @ 2.66 (stock)
Western Digitial 1 TB hardrive

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August 29, 2010 at 00:18:50
Congratulations on a great description of your problem and troubleshooting work to date. It saves a lot of needless duplication.

My only similar experience turned out to be a flakey PSU connection to the motherboard. In my case it was the 4 pin CPU power connection that was arcing leading to the periodic shutdowns. I only found the problem by close inspection of the connector which had burn marks on the plastic. This may or may not assist you in your situation but is worth the time to inspect and if you find it necessary, to tighten the female connectors inside their plastic shrouds.

Goin' Fishin' (Some day)

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August 30, 2010 at 14:49:58
Thanks for the reply. I unplugged all my psu cables again to check for any signs of defects and could not find anything. After firmly securing them back in their places, im still getting the random restarts :(

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