Had my first MBP stolen, so this is a replacement. Restored from a time machine backup which has caused the audio to go on mute, which I cannot disable. Also, my iTunes library is visible, but will not play ( sound wouldnt come out either way but it wont play in the bar where you can see the song progression ). Did a complete software update last night, didnt help. There is nothing else connected to the machine, and the optial issue I have read about on here does not seem to be taking place. Any and all help would be greatly appreciated.