Ive hooked up a 4 pronged s video cable to my TV but for some reason its comming up black and white on the TV. Ive done this before wit ha laptop and a different TV so im not able to see why this would be any different with my desktop. The desktop has a 6 slot s video cable in the back and im using a 4 pronged, could that be it? my video card is a GeForce 7800 GTX. Anything i can do to get the signal colorized?