Speakers and microphone missing in the Sound preferences for MacBook Pro?
All of a sudden my Internal Speakers & Microphone are missing as Options in System preferences. How do I restore?
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Anything plugged onto the Headphone port lately?
Have you done a PRAM reset, CMD+Option+p+r...
http://support.apple.com/kb/HT1379
In fact, do 3 in a row, takes a bit of time.
Intel-based Macs: Resetting the System Management Controller (SMC)...