Getting S/PDIF output working

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PROBLEM: No sound coming out of my Denon Receiver that is hooked to my pc via optical cable connected to the S/PDIF port.  If I set the system up to output to speakers connected to the green port I can get sound.

SYSTEM:
Athlon 64x2 processor
ASUS M4A78L-M motherboard
[root@NN nck]# cat /proc/asound/cards
 0 [SB             ]: HDA-Intel - HDA ATI SB
                      HDA ATI SB at 0xfe8f4000 irq 16
 1 [HDMI           ]: HDA-Intel - HDA ATI HDMI
                      HDA ATI HDMI at 0xfeae8000 irq 26
[root@NN nck]# uname -r
2.6.33.3-85.fc13.x86_64
[root@NN nck]# uname -a
Linux NN.FRONT 2.6.33.3-85.fc13.x86_64 #1 SMP Thu May 6 18:09:49 UTC 2010 x86_64 x86_64 x86_64 GNU/Linux
[root@NN nck]# uname -m
x86_64

SOFTWARE:
      Fedora 13_64, fully updated.

SETUP:
Hovering the mouse over the speaker icon in the top bar shows "Output 100%; 0.0db, RS780 Azalia Controller Digital Stereo (HDMI) so I am assuming that is the default sound output.
I went into alsamixer and muted everything except the SPDIF bars in both cards.

TEST:
I test the system by opening sound preferences, hardware tab, selecting the RS780 Azalia controller and running the Test Speakers app.  I do not get any sound.  I have my Denon set to Aux, 0db and Aux is set to Optical 1 and that port is connected to my pc.  I can see light coming from the end of the cable when the pc is on.

HISTORY:
    I have been working this problem since 1JUL10.  I first installed MythDora 12 and learned a lot about alsa, drivers, mixers and linux sound then started over from scratch with Fedora 13.  I quickly got to the same point.

Nick
"Open source costs time instead of money."
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