Click “Sound” in the sidebar. (On older versions of macOS, click the “Sound” icon instead.)

Toggle the “Play Sound at Startup” option to disable the startup sound.

If you’ve previously disabled the startup chime, you can re-enable it by turning on the “Play Sound at Startup” option here.

On macOS Monterey and macOS Big Sur, the option will look a little different, but it’s named the same thing.

If you don’t see a “Play Sound at Startup” option here, that means you’re using an older version of macOS—specifically, macOS Catalina or an older version of Mac OS X. The option is not present in this versions of macOS, as it was added in macOS Big Sur.

You can still silence the startup sound, but you’ll need to use a Terminal command that changes a hidden setting.

How to Change the Volume of the Mac Startup Sound

Your Mac’s startup sound depends on the volume level your Mac was set to when it was shut down. If your Mac was set to maximum volume level, the boot chime will be played at maximum volume. If your Mac was muted, the startup chime will be silenced.

Specifically, it depends on the volume of your Mac’s built-in speakers. If you don’t have any speakers or headphones plugged into your Mac, you can just change your Mac’s volume slider to control the volume level.

You can control the volume level of your Mac’s built-in speakers from the Sound pane in System Settings. Select the built-in speakers under Output and then choose your desired Output Volume.

Between 2016 and 2020, Apple released Macs with the startup sound disabled by default. (Before 2016 and since 2020, however, the startup sound has been enabled by default.)

If you are using one of these Macs and have a modern version of macOS installed, you can enable the startup chime from System Settings. If you are still using an older version of macOS and don’t have the graphical option, you will have to enable the chime using a Terminal command.

In a Mac, NVRAM is a small amount of memory that stores computer-wide settings. It remembers these settings without power, so they’re accessible at startup and available between system restarts.

With the commands below, we are changing a setting in NVRAM called “StartupMute” that tells the computer whether or not to emit the chime at startup. The ‘sudo’ command is necessary because ‘nvram’ is a powerful command that requires superuser permissions to use.

First, launch Spotlight Search by hitting Command + Space on your keyboard. You’ll see a large search bar pop up in the middle of your screen.

Type terminal and then hit the Return key.

This will launch the Terminal app. With its default settings, Terminal appears as a window with a black background.

In the Terminal window, type sudo nvram StartupMute=%00and then hit the Return button.

It will ask you for your password. Type in your password and hit Return again.

Now restart your Mac and see if it works. The chime should be there.

If you’re tired of hearing your startup chime and would like to disable it again, here’s how to do it.

Launch Spotlight Search by hitting Command + Space on the keyboard. You will see a large search bar pop up in the middle of your screen.

Type terminal and hit Return.

This will launch the Terminal app. With its default settings, Terminal appears as a window with a black background.

In the Terminal window, type sudo nvram StartupMute=%01and hit the Return key.

If it asks you for your password, type it in and hit Return.

Now restart your Mac and see if it works. The chime should be turned off.

How to Disable the Startup Sound on Older Versions of macOS

The following instructions apply to macOS 10.15 Catalina as well as earlier versions of macOS and Mac OS X. On modern version of macOS, you can simply use the checkbox in System Settings instead.

To permanently disable the startup sound so it isn’t played at startup on older versions of macOS, even if you have your volume level set to maximum volume when you shut down, you need to use a Terminal command.

Run the following command in the terminal window:

sudo nvram SystemAudioVolume=%80

Enter your password when prompted, and press “Enter.” Restart your Mac, and you won’t hear the sound.

If you’d like to undo your change later and have the startup chime play normally when you boot your Mac, run the following command:

sudo nvram -d SystemAudioVolume

Some people report that the above command doesn’t work on their Macs. If it didn’t silence the startup chime on your system, you may want to try running one of these other commands instead. These reportedly work for some people. This may be hardware-dependent, and certain commands may only work on certain hardware.

sudo nvram SystemAudioVolume=%01

sudo nvram SystemAudioVolume=%00

sudo nvram SystemAudioVolume=" "

(In the above command, that’s a single space character between the quotation marks.)