How to Fix Skype Sound on a MacBook Pro After Connecting to TV

So my MacBook Pro’s sound stopped working after connecting it to a TV to stream a Skype video call for an exercise class I was taking. When this happened, here’s the only thing that worked:

1. Open Terminal from your applications or search with ⌘+Space, start typing Terminal, then hit Return.
2. In Terminal, copy and paste the following command, hit Return then type your password, then hit Return again

$ sudo killall coreaudiod

This immediately restored sound so I could hear my Skype exercise class!