Disable MacBook from Booting Automatically
# Reenable the Mac startup chime
sudo nvram BootAudio=%01
# And to disable it:
sudo nvram BootAudio=%00
# To reset your Mac to its default behavior
sudo nvram AutoBoot=%03
Disable MacBook from Booting Automatically
# Reenable the Mac startup chime
sudo nvram BootAudio=%01
# And to disable it:
sudo nvram BootAudio=%00
# To reset your Mac to its default behavior
sudo nvram AutoBoot=%03
Disable MacBook from Booting Automatically
# for disable autoboot
sudo nvram AutoBoot=%00
#/Applications/Utilities/, and then enter the following command syntax exactly:
# for Return to Default Setting of Booting
sudo nvram AutoBoot=%03
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