After upgrading my Macbook to Yosemite, the volume icon at the top right is greyed out and sound does not work.

After upgrading my Macbook to Yosemite, the volume icon at the top right is greyed out and sound does not work.

Interesting bug. I'm cautiously optimistic this will get rid of the weekly annoyance. The difference is that I bought my laptop back in Feb 2015, so it came with Yosemite. I think the issue may have appeared soon after an OS update not long after I got the thing, though. I was using a sudo command in the Terminal, but that is obviously not a fix.
I wonder if there is a broken .plist file that may be fixed ...?

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    ~~~~~~~~~~~~~
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    ~~~~~~~~~~~~~
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