i have a K7N2G Motherboard, AMD Athlon XP 2500+, Geforce 5200 LE 256 MB, 768MB RAM, 400 W power supply. For some reason when ever I try to load Need for Speed Underground 2, HALO, Hitman Contracts etc. before it loads the game the screen goes black (like its about to load) then just restarts itself. I am completely in the dark about this. Doom 3 is choppy also (when I fire a shotgun shell for example i hear 3 or 4 shots going off when I jus fire one). I tried adjusting my display settings and audio settings, all my drivers are up to date. If anybody has any insight please respond.