I've been having issues with my computer lately and I just got my replacement video card. A couple weeks ago I sent off my 6800gt to get it replaced because I figured thats what was giving me all these problems. I figured this because when I put my old video card in my computer(ti 4600) I never got any errors. So now I have my new one and I still have weird problems occur. I downloaded Swat 4 demo and everytime I alt+tab it, or even exit out of the game, as soon as it shows the desktop it restarts my comp...why? This only happens with this game(so far), the only other 2 games I've tested are hl2 and wow, and those don't do it. I will try more eventually. Everytime my fish screen saver runs it will eventually freeze as well, which it does not on my old video card. I'm thinking its the power supply, since my old video card runs perfect but requires no power supply and my new one does require a connection to the power supply. Any ideas?