Turn off Mac boot chime

antichime.md

Antichime - Mute Mac boot chime

Warning I'm not responsible if something will go wrong, use at your own risc

Download the script and make it executable

chmod +x antichime.sh

Run the script, the boot chime should be muted, reboot to check

To turn the chime back reset NVRAM:

• Turn Mac off
• Turn Mac on
• Immediatly hold Option Command P R for 20 seconds
• Mac will reboot multiple times and the sound will appear

antichime.sh

#!/usr/bin/env bash

# Antichime - Mute Mac boot chime

# Make "chime" value mutable

sudo chattr -i /sys/firmware/efi/efivars/SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82

# Change "chime" value to "muted"

sudo printf "\x07\x00\x00\x00\x00" > /sys/firmware/efi/efivars/SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82

# Make "chime" value immutable again

sudo chattr +i /sys/firmware/efi/efivars/SystemAudioVolume-7c436110-ab2a-4bbb-a880-fe41995c9f82

printf "\nBoot chime have been muted (hopefully)"