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No sound in MacOS 10.7?

Well, now that more and more fanboys have upgraded to 10.7, the forums are full of it: sometimes it happens that sound stops working in MacOS Lion.
As it turns out, restarting coreaudiod is all it takes to get it working again:

$ launchctl list | grep audio
7159    -       com.apple.audio.coreaudiod

$ launchctl stop com.apple.audio.coreaudiod

$ sudo launchctl list | grep audio
7589    -       com.apple.audio.coreaudiod