PC shuts off unexpectedly
Here's is what I have
Athlon XP 2500+
ASRock K7S8XE motherboard
1.5 GB of memory
My problem is that my computer will shut off unexpectly when ever I use or do the following:
-Use iTunes to rip a cd
-Use DVD decrypter to encode a movie that is already on my hard drive, the pc will shut down in the middle or near the of the procedure with no warning.
-Use a graphic progam to see the way a room will look after it is painted(Glidden Color Program) and use the magnify button
Use a map editor for a game (Sudden Strike II)
I've had the current configurations and hardware for about 2 years. This problem started about 3 months ago right after I updated the BIOS. I read that that I my motherboard should be capable of USB 2.0 which after the BIOS update it was. Unfortunately, my screen would freeze up and I would have to manually shut the pc off. That problem went away after I went back to the original BIOS version (I still have USB 2.0 working), but was replaced with my new problem replaced it
I reloaded my pc and with only XP installed and tried to see if I could encode a movie. It shut off again. I am stuck. The pc works fine otherwise. My power supply is about 1 year old and is 425 watts. One other thing, when the pc shuts off unexpectely, to get it back on, I have to unplug the power cord for about 10 seconds (I use the light from my mouse to determine when it is ready).
There are no indication of any problems in the event viewer or when the pc starts back up. No error messages.