I recently had to restore my entire system from a Time Machine backup, and things have been weird since. However, my specific question right now is about the computer's volume. The computer was on mute when I made the backup from which it was restored, and now any time I start the computer, the sound is always muted (even if it was turned on when the computer shut down). Not only is this annoying, but it's also a sign that something isn't quite right with my system. Any ideas on how to fix it so the computer's volume is the same when I start it up as it was when I shut it down?