I just got my new system set up today. I'm running an AMD 64 3200+ on an ASUS K8V with a Sapphire Radeon 9800 Pro 128mb. When I turned the computer on for the first time everything was fine for about 3 minutes and then my screen checkerboarded. I checked all my connections and made sure the card was firmly in the agp slot, but when i turned the computer back on it checkerboarded immediatley. I even removed and reseated the card but to no avail. I put my old video card(geforce 3 ti500) in the computer and it works perfectly. Is my Radeon DoA? or is there something I'm doing wrong?