I primarily use my Mac for iOS development, so I rarely use audio and I commonly have it turned of to not disturb my co-workers. Therefore I'm not really sure when it stopped working.
Anyway, today I wanted to play a song, but I got no audio. I rebooted the Mac and still nothing. I rebooted again and noticed that the boot sound played, but once I entered OS X I couldn't get any sound to play.
What's up with that?