After 2016 the iconic startup chime was lost to us. For most it wasn't a big problem, for those of us who rely on audio queues it was a more substantial loss. A recent article outlines a way of turning it back on. It notes that it works for the moment but things, as with any update, can change. Copying from the article in question:How to turn your Mac startup chime on
- Open the Applications folder
- Open the Utilities folder
- Launch the Terminal application
- Enter sudo nvram StartupMute=%00 in the terminal, and hit return
If you want to remove the chime after re-activating it, use the command sudo nvram StartupMute=%01 in terminal.
Note: I have done this on my 2018 MacBook Air and it works though the chime is very quiet and, as yet, I've not found a way of turning it up though I do believe it should be linked to what ever volume your internal speakers are set to on shutdown. Any experiences well received.
Further note: Though this is highly unlikely to brick your computer or mute your sound card, I advise caution when ever tinkering with anything in the back end and any such tinkering is done at your own risk.