Ok, that helps.
What the HDAV does [as I understand it at least; I really need to get one myself to play with...] is outputs a combined audio/video signal from its HDMI output. It sounds like you are trying to do audio out via the cards HDMI output, while also doing video out from the GPU, which may not be the correct configuration.
I suspect the HDAV's HDMI output is taking over video output from the GPU, and you're not sending the video signal from the HDAV's HDMI output to the moniter. Then again, I've never had a chance to play with the card, so I'm unsure if this is in fact the case.
You might want to try Robscix over at the Guru3d's audio section; I know he's played with that card [he reviewed it, after all], so he'll probably be able to point you to the correct config for it relativly quickly.