Essentially, I'm trying to get to the reason why my computer (with XP home) crashes, at least once per day (the crashes seem to be getting more frequent now). By "crash", I mean it freezes up on me: no mouse, no keyboard and the fans seem to get a little louder. There is no BSOD or anything similar. If audio was playing, then I get the monotone, repeating "broken-record" sound (that's the best I can describe it).
I've downloaded memtest. I will do that shortly.
I thought that while I was at it, I'd also put this question out to all of you: I suspect my power supply is playing a role in all this; can you recommend a diagnostic tool that tests the power supply? whether I have a good/bad power supply? I apologize in advance if that's being naive (because perhaps you don't test the power supply!?)
1) The power supply is hooked up to a UPS unit; 2) it has been hot here lately.
Any help greatly appreciated.
Edit: From the suggestions below, it looks like I should also be considering an overheating issue.