Just to be sure... you have the S-Video and three component RCAs, right? Red, Green, and Blue? And on the tv, same thing; Red, Green, and Blue...?
And they're all hooked up, right? Hopefully this doesn't sound like a dumb question, but you're sure you have component (R,G,B) in and not composite (Yellow, Red, and White-the red and white obviously being audio).
I'm hoping that you don't composite and have the Blue going into your Yellow (composite) RCA in, and your Red and Green going into the audio. That's honestly what this looks like.