I've had my desktop for ~4 years now, and recently it started behaving really badly:
Whenever I run a Flash webgame or anything that takes up a great deal of memory - like a game, for example - everything will work fine for awhile, but after 10-15 minutes, the computer comes to an immediate halt. The fan goes dead, the computer turns off, the monitor goes blank. It behaves as if someone has just yanked the power.
What are some things I can do to troubleshoot this problem?
Perhaps the CPU is overheating? Maybe I've got some bad RAM?
Although I don't think it matters, I'm running on Windows XP.
Note: I realize this isn't exactly a "system administration" question since I'm dealing with my own personal desktop and it's not really serving anything up to the outside world at the moment. However, I'm asking for general troubleshooting tips for the symtoms described above - Symptoms that I think could easily be applied to computers/servers in general. If you don't think this is appropriate, feel free to close.