No audio on the right channel I have 13" MacBook Pro (Late 2009) model that is refusing to play sound on the right audio-channel.

Without any speakers connected it still plays fine but once I connect earbuds or a headphone, I only have sound in my left ear. In my right ear I hear a very low white noise sound.

I've tried rebooting, fixing disk permissions (very long shot, I know), same problem if I play sound in a virtual windows machine. And off course I've verified that the sound balance is set to both left and right.

I've "looked" into the mini-jack output but can't see anything wrong with it...
Check your settings in System Preferences > Sound > Output.

I had the same problem and for some mysterious reason my left-right balance was completely screwed up.

No idea how it happened but once I adjusted it to center it now plays back perfectly (: