Why isn't the sound working on my Facebook?

What operating system and/or browser are you running Facebook on?

Windows 10, Firefox.

So the volume control on the videos goes up & down but you hear nothing? And other web sites with sound like YouTube play sound ok?

Yep. Works on my phone too. I guess I need to reboot.

Ok. I looked and didn’t see another sound setting either.

My diagnosis as a professional software developer is “that’s weird!” To which the usual first step for Windows may be to reboot Windows, as you said.

If that fails, I might try to go into Windows 10 (which I thankfully don’t have) Control Panel and try to find the sound volume “mixer” – whatever they call it in Windows 10. It generally has different volume/mute settings for different types of audio. I’d play something with sound in FB and then unmute things in the mixer to see if it does anything.

Oh I looked for the sound control first thing. The rebooting must have done the trick because it’s back.

Thanks.