I have the Sapphire Radeon 9600 video card which also has a DVI out on it. I recently just bought a 6 foot DVI cable which I connect to my Sony 51" Widescreen HDTV, the model # is KP-51WS510. I can get the image to display on the HDTV, but the resolution can only go up to 640 x 480, so I'm missing out on alot. How do I get this to display correctly on my TV?