Optical Audio not working on 2006 Mac Pro 1,1 after 10.6.7 update

Hi all,
I have no digital audio output on my 2006 Mac Pro after I updated to 10.6.7. System Preferences recognizes the output but their is nothing coming out. The digital audio port goes from steady red at startup to dark, indicating that it is not receiving anything. I have switched to another digital audio cable with no effect whatsoever.
I reset the SMC with no effect. I have read online that other users are having this issue as well. I appreciate any input or insight into the issue.
Thanks!
Message was edited by: nomadmnemonic

Thanks for the reply a brody.
It has been 3 months and the issue still persists and has not gone away. I agree with pantufl that my Mac has become buggier since 10.6.7. The doc I read and reread didn't do anything except change the frequency rate. There is still no sound.
The update to 10.6.8 didn't resolve anything except prepping it for 10.7
This is extremely frustrating especially since I recently upgraded to a 55" Samsung LED LCD monitor and Onkyo HT S7300 system. I also recently upgraded to EyeTV HD and use my Mac as my HTPC.
I will try the feedback post to see what Apple has planned, if anything.

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