Bugs: Internal speaker disappeared in Yosemite, after using external speaker
Ace laptop, Yosemite
Internal speaker disappeard on "Sound preference"->"Output" menu. No sound played.
Solution: Plug and unplug speaker input, and really jiggled it a bit to flip the switch.
http://betanews.com/2014/08/26/how-to-fix-disabled-audio-in-os-x-10-10-yosemite-beta/
https://discussions.apple.com/thread/5432158
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