Recent Macs have been missing something that has been part of the Macintosh experience since 1984 — the startup chime. For example, the 2019 16-inch MacBook Pro is silent during startup, along with other new Mac models. Fortunately, a few Twitter users showed that a simple Terminal command can bring back the chime.
As reported originally on AppleInsider, Twitter user @chaysegr posted a video showing a formerly mute MacBook Pro chiming at startup, which prompted a reply by @TempAccountNull that showed how it worked:
It’s easy to bring back the startup chime. Launch Applications > Utilities > Terminal, then copy the following line of code and paste it at the command line prompt:
sudo nvram StartupMute=%00
Press return, and the next time you reboot your Mac, the startup sound is back! It can be muted once again by using this code:
sudo nvram StartupMute=%01
While this definitely works with the 2019 16-inch MacBook Pro (I tested it), AppleInsider found that it doesn’t work with some other models. An update to macOS in 2016 originally removed the chime, but a terminal command to bring it back was quickly discovered. A later macOS update removed that terminal command, but it’s back again. Whether the chimes are here to stay in the future is up to the whims of Apple.