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ADDITIONAL TRICK TO GET SOUND/AUDIO!
on April 23, 2012
Okay, I thought I got a bunk dongle. It doesn't say anything like "Monoprice" on it and I couldn't get sound. [Early 2011 13" MacBook Pro running Snow Leopard 10.6.8]
1) I had gone to System Preferences for Sound and selected my HDMI in the outputs ... but that wasn't working. After much fiddling I had a sudden memory/revelation:
2) Go to Audio MIDI Setup (it's in your Applications-->Utilities or just Spotlight it) and find your HDMI output in the list on the left. Highlight it and where it says "Format" in the right pane, change it from 96000.0 Hz to 44100.0 Hz.
Your Audio MIDI Setup configuration might look different from mine but the key is to ratchet down those Hz.
Good luck and happy listening!