The rest appear to be ground.. You could adapt a regular molex to that quite easily.. Just cut that harness off the dead PSU, and wire it up to a 4 pin molex..

My new Dell Inspiron 700m has a 7-pin female S-Video connector... my old laptop had a 4-pin, so that's what type my s-video->RCA cable is. Since the extra three pins are for ground and a composite ...