Audio is Muted - iTunes Won't Play
*This is a software problem - not hardware*
I have a problem where the audio is muted and I can't un-mute it. I've had a look around but can't find a solution.
Here is a summary:
* The audio is muted and grayed for all outputs
* If I hover the mouse over the volume control on the top bar you get the spinning wheel
* If I boot back in to Snow Leopared (I have a dual boot system) it all works fine - so clearly there is no hardware problem
* I tried to reinstall from a Time Machine backup and it WORKED again - but then Time Machine erased that backup so I can't do it again, and now (after a few hours) it's muted again (following a Premiere Pro crash).
Is there anything inserted in the audio chain by Premiere Pro (or other app) that could have got stuck and be broken?
Any way to clear the adudio chain?
Mac OS X (10.7.4)