Launch Terminal from your Applications > Utilities folder.
Type the following command and hit Enter.
sudo nvram StartupMute=%00
Input your Administrator password when prompted and press Enter.
Reboot your Mac. You can do this by selecting Restart from the Apple menu at the top left of your screen.
You can disable the startup chime using the command sudo nvram StartupMute=%01
This tip was shared on Twitter by @chaysegr via @9to5mac.
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