Lately I have been worried about cooling with my CPU...It's a pentium 4..I have my cooling monitor on and Im not sure if this kind of heat is normal...In idle, my cpu usually runs at about 38 - 42 c..And I used to be able to play unreal tournament for hours without a problem, but lately since i have been hearing weird noises from my back fan, my computer seems to over heat...I start playing ut, and everything seems fine, but when i look on the heat monitor it gets to about 73, which used to be it's normal temp, but then it got to 81, and the game and the whole system froze...Maybe a fan or heat sink died ? Dust build up ? Don't forget lately i have been hearing weird humming from one of the fans..Some of you cooling freaks give me a hand with this, because I don't want my box to be unhappy...