HDMI TV not showing as audio output in System Preferences I have linked a cable from my MacBook Air to my TV via HDMI but cannot get volume on the TV. I have gone into preferences-sound but their is no facility to change 'internal speakers'. How can I do this?
If you are using a Mini Displayport to HDMI adapter this should help you.  If you are using Mini-DVI to HDMI adapter then you will have to get audio from your headphone port via an external cable because DVI is strictly video.