Hoping you folks can help lead me down the path away from the ledge...
Have a really strange problem with system shutting down with no warning, and no logs being created. Here's what I think I have figured out so far: It's not a virus in the OS (Win 8, but drive has since been wiped out), and I don't think it's an overheating problem.
I have two hard drives in the computer, one is a 500GB with Win XP still loaded on it, the second is a 2TB hard drive that I had installed about 10 months ago with Win 8. Motherboard and CPU are both about 4 years old, AMD X4-925 on a MSI NF750-G55 board. Most of the time the computer is run in Win 8 and about a week ago I started having the computer just shut down randomly (like you expect if you just pulled out the power cord), sometimes might be after the computer is on for 30 minutes or after 2. Now this is where it's getting me twisted up, I can run the computer from the drive with XP on it with no problems.
So far I have wiped out the Win 8 hard drive and attempted to reload the system, but it shuts down before Windows can complete the installation. Have replaced the power supply (went from 550 Watt to 750 Watt) and have bought another new hard drive. After changing out the power supply still getting the problem, even when I try to install the system on the newest hard drive.
And the XP drive still works with no problem.
Next thing I am thinking I'll try is replacing the motherboard and CPU, but would rather avoid spending the money.
Thanks for any ideas/help here.