|"checking temps or power supplies, though i have heard those are the most probable causes."|
I certainly agree with that. You can usually (but not always) check your temperatures and voltages by running the bios 'Setup' routine. On one of the first screens you get when you boot up, you should see a line on the bottom of the screen tht says something like 'hit the delete key (or one of the F keys) to enter setup'. You will have to scan through the screens to find the information. All Bios' are not the same.
The case temp should about the 30s & maybe low 40s, and the CPU temp should be about the 40s and maybe low 50s.
The box may need to be cleaned. Use a can of compressed air. Do not use a vacuum cleaner, they can cause a static failure.
The power supply might have to be swapped to eliminate it as the problem.