Cult of Mac

No HDMI Sound Under OS X Lion Using A Mini DisplayPort or Thunderbolt Adapter? There’s An Easy Fix For That [How-To]

I’ve mostly been very happy with my migration to Lion, but I did get bit with one bug after the upgrade: for the life of me, I couldn’t get sound to output through HDMI when using my Kanex Mini ...
Ars Technica

Using DisplayPort on Dell e6400 with HDMI Adapter = No Sound

My hotel TV is an LG LCD tv, and they have one of those HDMI/VGA/Analog Audio breakout boxes. I happened to have my Displayport to HDMI adapter and cable with me. If I plug it in, the TV automatically ...
Ars Technica

hmm, no sound out over HDMI? using LG Ultrawide monitor

Recently bought an LG 25UM56 monitor. Connected via miniDisplayPort-to-HDMI. I can't seem to get sound out from my MBA. Googlefu Force has failed me.
ecoustics

Picture But No Sound? Sound But No Picture? Troubleshoot Your TV or Home Theater System Like a Boss

If you can’t get picture or sound from your TV or projector don’t despair. Here are some debugging tips from our resident home theater pro. Inevitably, one day you’ll go to turn your TV or A/V system ...