catalina (10.15.7) sound volume control not working
Hello. Just recently my sound volume control is not working. To be clear, it is the volume control -- both the keyboard control AND the audio control dialog. Sound comes out, the mute button works, and using the volume slider will mute the sound and turn it back on, but the volume will not change - sound is either on or off, but I can't change the volume. This is true for the internal speak as well as a connected bluetooth speaker. I'm no aware of any software update, nor does rebooting make any difference. One day it simply stopped working. This is a mac mini late 2012. Any ideas? Thanks
Mac mini, macOS 10.15