This is the problem im having..
Im using a MacBook Air OS X 10.7.3
The sound icon is shown 'greyed' out.
And i've found that whenever i plug in an audio device (headphones) the sound is disabled for about 10 minutes.. very annoying.
And then when i unplug the device it is disabled for about another 10 minutes..
Also when the sound is disabled, songs on iTunes wont even play, let alone be heard. However i did find that garageband can somehow play with sound..
Any suggestions?