HDMI audio not working

I recently purchased a LG LED LCD Tv to attatch to my PC via an Hdmi cable.  I have it all hooked up, and i get video to the tv... but there is no sound.  I have gone into sound options, and there is no HDMI option.  I have the show disabled and such checked... I have no clue what else to do. 
I am running amd athlon 64 x2 dual core processor 5200 2.70 ghz.  4 gb memory.  64 bit operating system
Any suggestions on what else to try?
and i am running vista home service pack 2

Here is a long thread with a discussion on things to check: http://www.tek-tips.com/viewthread.cfm?qid=1687463
Sad part is, it may just not work.  I assume the graphics card is a PCIx16 and not built in on the motherboard.
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