MSI 870a-g54, Windows 7 x64, random shutdowns, all peripherals shut off but fans go full blast

MSI 870a-g54 (BIOS up-to-date)
Windows 7 x64 (All updates installed)
AMD FX 4100
Nvidia 9800 GT (Drivers up-to-date)
4GB DDR3-1600 RAM
800w (might be 750w) power supply (I believe it's a Coolermaster)
OCZ Agility 3 SSD

The computer can be idling, under heavy load, playing a game, or anything at all, and then suddenly all the peripherals, including USB, video output (monitor goes black), ethernet, audio, etc., all shut off, but the fans all go full blast. The power button on the front of the computer also stops functioning, and the computer has to be turned off by flipping the switch on the back of the power supply. The voltages are all fine on the power supply, and no overclocking has been done. Temps are all well within reasonable bounds as well (replaced all the case fans with nicer ones a couple days ago just to make sure). I'm not sure what else to try.
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More about msi 870a g54 windows x64 random shutdowns peripherals shut fans full blast
  1. Try running a memtest it could be failing RAM. Could also be windows.

    Don't much like CM PSUs, but it's overspecced enough that it shouldn't be an issue.
  2. Ran a memtest already, forgot to mention that, all tests succeeded. Just ran a chkdsk and I'm seeing if it runs okay now, but I dunno. I also replaced the DVD drive because the one that was in there wouldn't boot from any CD's or DVD's.
  3. I'd say it's most likely to be a corrupt copy of windows, which chkdsk may or may not find/fix.

    Does it happen at a particular time, or while you are doing something?
  4. It seems to be completely random. It might happen while playing a game, or it might not. If you just leave the computer idle for a couple hours, it'll shut off on its own too. It's shut off in as little as about 20 minutes, but sometimes it takes hours. I just don't understand why the peripherals and everything would shut off, including the power and reset buttons on the front of the computer, but the fans would go full speed indefinitely until power gets disconnected. I don't understand how Windows could cause that, but I guess anything's worth a try.
  5. That sounds somewhat like Windows - if it was the PSU, it would just reboot. Motherboard, it might end up doing something similar, but that's less likely. Try running a copy of Ubuntu off a USB drive, and see if it crashes.
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