PC Crashing

[FatalChaos]

This has only happened while playing Dawn of War, and i use my pc for tons of other stuff besides DoW.

While in an online game in DoW occaisionally my pc will just make a long beeping sound and crash. no error reports or anything. And windows doesn't say improper shutdown detected either. Any ideas?

[TBS]

could well be overheating, could also be bad memory.

Try taking the side off the case and running memtest respectively.