Andy Sowards-
OMG AWESOME MAC TRICK! On my macbook pro – sometimes the sound goes out for no reason, to fix it all you have to do is run this command and it will restart the audio process
start Terminal.appenter the command:sudo kill -9 `ps ax|grep 'coreaudio[a-z]' |awk '{print $1}'`press enterenter your password when prompted and press return
