HP M9600T desktop, trying to replace video card. New card is GeForce 9600 GS. The old card had a 2 pin connector. The new card has a 3 pin connector. On the motherboard it appears labeled SPDIF OUT 2, on the new card it appears to be labeled SPDIF IN. But as I said the new card has a 3 pin connector and the existing cable from the motherboard has a 2 pin connector. First question - does this cable HAVE to be connected? If yes, what do I do? Thanks in advance for helping this dumb old man.