Sometimes after connecting my Macbook to an external video device (for example through an HDMI adaptor) my speakers disappear and I can't choose them as an audio output any more.
Here's what's fixing it:
1. Open the Terminal
2. Type: sudo pkill coreaudiod and press enter.
3. Type in your macbook password and press enter.
That's all. The speakers are back.
If that doesn't work try: sudo kill `ps -ax | grep 'coreaudiod' | grep 'sbin' |awk '{print $1}'`
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