I know I have all the theory wrong here, but when I needed to hook up PC's S-Video output to my TV's run-of-the-mill video-in. I just connected both GND together, and both live wires together. Works like a charm.. not even a single interference in the screen, top quality. From the little I've read about it.. it seemed to say that S-Video is basically just the same signal, twice, so there's no signal loss. One is *slightly* different and you may need a small piece (cap, res... dunno) between the two lives if you have intereference.
So yes, all signals should be easy to find on the mobo.
