Mini Mac sound stopped

What year model Mac Mini?

https://support.apple.com/en-us/HT201894

If it an Intel Mac Mini, reset the NVRAM.

https://support.apple.com/en-us/HT204063

Also restart, then check your main volume slider and the slider in Music or whatever app. you’re using.

At is point, it is impossible to say for sure what is happening, without seeing screenshots of your Sound Preferences and Audio MIDI Setup panels.

If the NVRAM reset didn't work, then try resetting the Audio MIDI setup by opening and then quitting Garage Band.

for reference, see > https://www.cnet.com/tech/computing/how-to-reset-the-audio-system-in-os-x/

Also check to see if anything

at > https://support.apple.com/guide/audio-midi-setup/if-your-audio-apps-stop-working-amsfa3961363/3.5/mac/12.0

and > https://www.makeuseof.com/tag/sound-advice-fixing-common-mac-audio-problems-os-x/helps.

or > https://www.sweetwater.com/sweetcare/articles/resolving-audio-interface-issues-on-m

helps to fix the problem.

Test a set headphones, speakers or buds in the Mac Mini's audio out port.

Please work thru what I just posted at 9:59 AM.

Plus it would help if you posted some screenshots of what you are seeing.

Alt = Option

You're welcome.

No problem. I don't do YouTube that much, but have noticed that some YouTube videos are muted out of the starting gate.