How to re-enable the startup chime on a late-2016 MacBook Pro


For some, Apple's decision to drop the startup chime from the latest batch of MacBook Pros came as great news -- for others it was an absolute travesty.


The quest for a silent startup has led many Mac users over the years to seek out third party tools to kill the sound, but now that it has gone there are those who want it back. All is not lost! If you prefer a musical start to your computing sessions, you can re-enable the chime.

As discovered by one enterprising MacRumors forum user, all it takes is a little work in Terminal. (The usual precautions apply when tinkering with such things -- proceed at your own risk, etc, etc, etc). It's also possible to stop the new MacBook Pros from starting automatically when the lid is opened. Here's what you need to do:

  • Disable the startup chime:

sudo nvram BootAudio=%00

  • Re-enable the startup chime:

sudo nvram BootAudio=%0

  • Disable automatic startup:

sudo nvram AutoBoot=%00

  • Re-enable automatic startup:

sudo nvram AutoBoot=%03

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