MBP 13 (mid-late 2010) still won't play audio through HDMI

I would like to connect the MBP 13" I bought in 12/2010 to my HP w2408h 24" monitor through HDMI, both audio and video. I bought a Moshi mini-DP to HDMI adaptor, and hooked everything up like I was supposed to.
When I go to System Preferences > Sound to try to select HDMI as the audio out, it tells me that "The selected device has no output controls." Mind you, I've tried three different HDMI cables, including the Vizio cable I just bought (with gold-plated connectors, natch!). Furthermore, when I try to run audio from the MBP's headphone jack to the monitor's audio in port, there's nothing there!
FWIW I'm running 10.6.6, and didn't try this set up before I upgraded from 10.6.5
What to do? Please advise.
Message was edited by: Pesachyonah

Mind the bump, but I'm having this exact same problem and nothing I try is helping.
I have a mid-2010 MBP, so I know it supports audio. The video works just fine, but when I open up the sound and change the output setting to my tv, it also says, "The selected device has no output controls." But I KNOW that the cable and my laptop work with the audio, because I can play the sound effects under the sound preferences through my tv speakers, but nothing else. Which is REALLY confusing. There's some static coming from my tv speakers, but that's it.
If it matters I'm running 10.8.2.
Help please, and thanks in advance!
Edit... So apparently iTunes works just fine as well. WHY can't I play anything from Chrome? Ugh.
Message was edited by: hillary5892

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