can't seem to get the digital audio output to work on my PC to my yamaha reciever. on the PC volume control i checked the box "1 Digital Output Only" but still can't get sound to come out of my reciever. i tested the settings on my reciever with my dvd player and everything is properly set so i should get sound of out that input. i figure it's a PC side problem and wondering if anyone has any tips to get this working. i'm using a HP tower that has integrated digital audio output and i have a separate card (SB audigy ZS) for my desktop speakers. also i'm using a coaxial cable to connect the two.