I have the Yamaha YHT-360 Digital home theater system and i hooked it up to the IO box for my sound card with a Optical Cable. But no sound! Nothing from PowerDVD or my MP3 player. There are 2 optical cable inputs on the reciever. 1 for the DVD player and one for Cd Player? I tried the cd player one cause i have a DVD player plugged into the other. I think I have everything setup right on the computer. Any suggestions for a newby? Thanks