Random Shutdowns....

[Master [H]]

I'm pulling my hair out on this one, but anyway. I'm having some issues with sporatic system shutdowns.

System:
DFI LanParty UT NF4 Ultra-D, with 704-2BTA bios
Athlon64 X2 3800+
2x 512MB PC3200 Crucial Ballistix, 2-3-2-8, 2.8V
PNY GeForce 7900GS
Western Digital 160GB SATA
Seagate 160GB SATA
Pioneer 109BK DVD RW
Samsung SW252 CDRW
CMD649 ATA100 card
Philips Dyamic Edge 4.1 sound card
Corsair HX520
Arctic Cooling Freezer 64 Pro
Windows XP Pro SP2

4x 80mm fans
2x Blacklight cold cathode
1x 3-LED piece (Glowire)

Background:

A few months back, my Enermax EG565P-VE went out on me: loud pop and the machine didn't power on again. I replaced it with a Thermaltake Toughpower 600W. Soon after, I started having issues with the machine inexplicably shutting down. I'd be surfing the internet for example and it would power off. I'd power it back on and have no issues from there on out until the next time. The next time could be within the next 24 hours or not for another 5-6 days.

Well, I ordered a Corsair HX520 and installed that. Within a few hours, it shut off again.

What I've done/checked:
-All 4 power connections are plugged in
-No bare wires from what I can see. I've jiggled them to see if there's a loose connection, but there's not.
-Scanned for viruses, adware
-Ran Memtest
-Checked Event Log for anything suspicious
-Temps might hit 35*C on both cores...

Now I thought I'd be fine, but I guess not. I'm not overclocking, and I have not overclocked this CPU at all. Basically, I'm really left scratching my head on this one.

 

[DeChache]

Sounds like the mobo is going out I was having similar problems that went away with a new mobo and my performance increased in the process(Though I'm guessing it was due to the bad board) But my mobo was defiantly bad sometimes it took 2 or 3 tries to get it to recognize that there were hard drives installed.