My friend is tryng to hook his computer up to an hdtv but when he plugs it in only parts of the desktop shoe up on half the screen and only for a few seconds. this computer is a amd athlon xp2700+ 2gb ram 2x 200GB HDD Geforce FX5500 windows vista home premium. I downloaded the video card drivers off the nvidia site and installed them but the nvidia control panel doesn't show up and that is where the settings for the tv would be.