![]() On Mac running macOS Big Sur or macOS Monterey, the volume slider is in the control center. ![]() If your Mac doesn't have a mute key, another way is to drag the volume slider to the very left from the right side of your Apple menu bar. One way is to use the "F10" key (the Mute key) on your keyboard to completely mute your Mac from playing boot sound and any other sound. If you just think Mac startup sound is too loud and want to turn down the volume or completely mute your MacBook Air/Pro temporarily, there are two ways to do so. You can switch off the startup sound by muting the volume before shutdown. When you have a new Mac, the startup sound is set at maximum volume. The volume of your Mac's startup chime depends on the volume your Mac was set to when it was last shut down. How to turn off MacBook startup sound temporarily? Uncheck the box "Play sound on startup" to stop your Mac from playing the sound the next time you power on your computer or laptop. ![]() Click the Apple logo from the left side of the Mac Menu bar and choose System Preferences from the Apple Menu.ģ. You can disable the startup sound in Sound settings in System Preferences.ġ. Run the following command in the terminal window: sudo nvram SystemAudioVolume80 Enter your password when prompted and press Enter. ![]() Or, you can open a Finder window and head to Applications > Utilities > Terminal. Your Mac is set to make the iconic chime at startup. Press Command + Space to open Spotlight search, type Terminal, and press Enter. How to disable MacBook startup sound from the System Preference menu? You can disable the startup sound on your Mac permanently with Terminal commands or temporarily by changing the audio settings. It is easy to silence the boot sound on your next boot. However, it may be inappropriate when your Mac is booting up in a quiet place like a library, a classroom, or a conference room. At boot up, right after power on, it will chime, saw the Apple logo, and then logo disappears, chimes the second time, and. It reminds you that the Mac is starting up and will be ready shortly. To turn off, use this code: sudo nvram StartupMute01. No more audio when connecting your power source.After you press the power button, open up the lid of your newer MacBook Air/Pro, or restart your Apple computer, it will make the traditional startup chime by default. Sudo chmod 644 /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aif Sudo mv ~/Desktop/null.aif /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aifīe sure to fix the permissions on the file: sudo chown root:wheel /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aif With SIP disabled, I backed up the original chime and replaced it with my new audio file: sudo mv /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aif /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aif_bak I created an empty AIFF file using Adobe Audition. One way is to hold down the power button and the home button at the same time until the phone turns off. The chime audio is located here: /System/Library/CoreServices/PowerChime.app/Contents/Resources/connect_power.aif There are a few ways to force shutdown an iPhone. You can create an empty AIFF file to replace the default chime. Here's another solution since the others provided don't seem to be working for you. The solution is to set ChimeOnNoHardware to true instead of setting ChimeOnAllHardware to false (note, No instead of All): defaults write ChimeOnNoHardware -bool true
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