Just got my computer back from a shop in Oak Park. The guy kept telling me it's a software issue, possibly due to a bad hard drive. I have Raid 0 and the guy said it's mirrored so it doesn't matter if one drive is bad the other drive will have the same corrupted files.
I still think Bek is right, and it's more a hardware issue. The guy said it can run for random times. Usually just for a short time and on occasion for longer than an hour.
I'm going to check to see if the thermal compound is good, but in case it is and the CPU is going bad, can I just replace that? Does the mother board have to be replaced too?
WTF? RAID-0 is NOT mirroring, that's RAID-1.
To your later questions, that remains to be seen. If I were in your shoes and trying to troubleshoot all of this, I'd start with the following steps.
1. Thoroughly dust/clean out the PC. All nooks & crannies, especially fans & power source.
2. Ensure that then powered on, all fans work as expected.
3. Replace the CPU thermal compound with fresh, high quality compound.
4. Run the PC with the box OPEN and an extra portable fan blowing on all hardware. See if the PC can remain active while installing diagnostic software that actively reports AND logs CPU/PC temperatures (all dependent on what is available given your hardware)
5. If PASS, then repeat without extra portable fan.
6. If PASS, then repeat under normal conditions.
7. If fail, then repeat while running in Windows SAFE mode.
8. If fail, then repeat while using a Linux boot CD.