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Question: S/PDIF Connection?

I recently built a new system with this mopbo. The only problem I have encountered thusfar is with the S/PDIF out port on the back. I am using the onboard audio, (no audio PCI card installed). I am trying to connect my pc to my Kenwood 5.1 surround sound sysytem through this port, but can't seem to get a signal from my pc to the receiver. Any suggestions?