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Builtin speaker disappeared from System Preference -> Sound

I am using a mid 2011 27" iMac. For some reason, after a restart, the built-in speaker disappeared from Sound in System Preference. I have rebooted a few time. Every time I can hear the startup ...
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Can I make my iMac output audio to the speakers when headphones are plugged in? [duplicate]

Possible Duplicate: How do you switch between built-in audio and headphone audio without unplugging? When I plug in my headphones the built in speakers are no longer an option for audio ...