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