I recently upgraded my systems video card from a GF2 GTS-V to a Radeon 7500. Everything seems to run fine except that after I'm done playing certain games (Max Payne and Jedi Knight II, in particular), I choose "exit" on the game and then the screen scrambles and locks up. In some cases, the screen is the only thing that scrambles, but in other cases it seems the entire system locks up and I have to restart. Wondering if its perhaps the motherboard...ECS K7S5A. Any ideas as to whats going on and how to fix it? 
