As I was trying to troubleshoot why my media center Mac Mini froze twice over the last 2 days, I discovered that the sound output didn’t list the Built-in speaker. After a bunch of searches with different suggestions, I decided to reset the NVRAM. The problem is that the Apple support docs say to use Command-Option-P-R at startup and my Mac Mini doesn’t have a monitor or keyboard hooked up to it. After some additional searching I found the following command:
sudo nvram -c
and then a restart. After I did that, the sound output options were back. Yeah! Does this solve the freezes I’ve seen? I have no idea, yet, but at least I know one problem is solved.