How can I activate the startup sound

Hello, curiousness.

In Catalina you can use these Terminal commands.

I don't know if they work in Mojave.

To enable the startup chime start Terminal and enter:

sudo nvram StartupMute=%00

You will be asked to enter your admin password. The password will not display onscreen.

To disable the startup chime start Terminal and enter:

sudo nvram StartupMute=%01

You will be asked to enter your admin password. The password will not display onscreen.

curiousbuss Said:

"How can I activate start sound in Mojave"

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Try an Upgrade/Restore:

One other thought (and I don't know if it would work), might be to upgrade past Mojave, and then restore to Mojave. All of this would be performed via the following.

1. Backup: your Mac
2. Upgrade: to Catalina or Big Sur.
3. Restore: from the backup in step 1

That is what I had to do. Using a terminal command did not work. Now I'm running Big Sur and still OK.