At times, like after a OS X/macOS update, my Apple Mac’s internal speaker and headphone port stop working. Neither will put out any sound. Others report a similar problem on the Internet. But none of the solutions I found on the Internet worked for me. Here’s what worked for my Mac Mini:
- Using Finder, open the Applications/Utilities folder, then start the “Audio MIDI Setup” app.
- Select the “Built-in Output” in the left panel. Click on the Format selection in the right panel for Output, and select something low like the “2 ch 16-bit integer 44.1 kHz.” (You may have to go lower to 32 kHz.)
- Select “HDMI” in the left panel. (If you do not have HDMI, select each output in turn.) Again change the Format in the right panel for Output to a lower-res bit rate like”2 ch 16-bit integer 44.1 kHz”. (You may have to go lower to 32 kHz.)
With that fix, I can hear sound through a nice set of speakers connected to the headphone port instead of the monitor’s stereo speakers. Perhaps the problem is related to my use of a monitor with stereo sound that I run using an HDMI connection from the Mac. Perhaps not. That is for Apple to resolve.