Recently, my GF4200 has been freakin out on me randomly. I am wondering if it is a heat problem, ie if my fan is dying slowly. Happens most often when I am playing CS or TFC or other game (I suppose since that is what I mostly do!). Right in the middle of the game the screen flips out and goes pink lines and bands solid from top to bottom. About 2 seconds later, the system freezes...I have to turn it OFF and then on again. If I just reset, the screen will stay that way. Whatya thinK?