My GTX260 fan kept getting really loud after a while of starcraft sessions.. not long after the game would lag really bad. I'd go to restart but it would bluescreen+crash when starting back up..
took me a while to figure out it was a heating problem, but now im pretty sure it is because it would always come back after 15-20 of cooling off.
I'm not 100% sure if it was my cpu over heating, or my video card. I cleaned them both out and haven't had problems since... but I don't think i've been putting in as many starcraft hours.