Power Mac G5 Audio is outputting only the right channel

I have an audio problem with my PowerPc Audio card, I presume. It is only outputting the right channel. I have a set of computer speakers and when I go into System Preferences and move the balance slider, there is only sound coming from the right channel. Absolutely nothing from the left.
I found this problem when editing in FCP and needing to do a split track with VO on channel 1 and Nats and music on channel 2. I could see the meters showing the audio output from channel 1 but no sound coming through the Mac's left channel output.
Also, I have a DeckLink extreme card in my system and when I test the L-R channel output I get the same problem. I do not know if the decklink is somehow using the Mac audio card for help with its output. I would think that it is using its own hardware for generating the audio output from the card.
Hardware issue? Time for a Mac Genius repair? Don't know if there is any workarounds or fixes before I go that route. Any help would be appreciated.
Thanks
Doug

No I didn't but I run my Mac's output into an analog mixer and then out to my speakers.
When outputting through channel 2 only, both speakers work, yet when I pan to channel 1 the sound drops out. As I pan from full channel 2, where both speakers are up full, you can hear the sound fade out.
Also, I got the Deck Link card to work through my mixer. The L and R channels are outputting through separate inputs in the mixer and work independently and correctly. I even changed out the mini stereo cable just in case and still no left channel out of the Mac.
Very weird! I've even repaired and defragged my system disk in case it is some sort of corrupted code. Just grasping at straws before I take it to a Mac Genius.
Thanks for writing. I appreciate any and all suggestions.
Doug

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