I'm running 10.8.2 on a 2011 MBP17. I'm not sure when this started, but Mail gives me NO sound. Not the New Mail sound, not the ding when I check mail, the Sent Mail swoosh...all gone. Nothing. I read about it happening for people where the sounds work fine, but after the computer wakes up from sleep, their gone. Not the case here. Even after a restart, still nothing. Here's what I've checked: - Mail settings - New Messages Sound is selected. Even tried other sounds. - Use IDLE command is checked. I read that this was a problem for some, but not an issue. - Repaired Disk Permissions. - Notifications Center has the proper settings for the sound alert - Audio Midi Setup. Read a fix about opening that app, changing the format and back again, which should cause all backed-up sounds to play. Didn't work for me. - Did a force quit on coreaudiod in Activity Monitor, which I heard can work. Didn't. - I don't have Power Nap on this machine, so that's not the issue (was for some) I do get audio from audio attachments, for what that's worth. But I've tried everything I could find on the issue. Anyone have a similar problem and come up with a solution?