No sound on my Macbook... no internal speakers listed in Sound preferences
I have no sound on my Macbook. No internal speakers listed in the sound Preferences in Output.
MacBook
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Have you had any thing plugged into the headphone port recently?
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)...