My computer keeps getting these problems where the computer will just shut down and my bios will give a high and then low continuous beep. It seems to happen most with games, namely any given time in Return to Castle Wolfenstein, though recently when I exit Counter Strike it's happening too. Sometimes it even happens out of games, like when the computer first loads into my account or if I've got multiple processes running. It's weird, because sometimes I can have Firefox with multiple tabs, Blender, Dev-C++, Winamp, Shareaza and be browsing files with no problem, but I was running Firefox and Skype and that did it.

I've noticed my computer, on the inside, has been getting warm, plus it's been kind of hot out lately. I only have one case fan, and it doesn't seem to be doing much output. On the other hand, my friend said he gets that same beep with his RAM sometimes during his POST. I tried swapping out the stick of RAM that I know is likely to be a problem (a budget stick sent to me in a plastic bag and a rubber band, no joke) but I still got the error.

Any recommendations? I'm thinking I'm going to buy a 120mm case fan this weekend for the back, and maybe another 512mb stick. I'd like to hear another's opinion before doing anything.