How do i turn off the startup sound on macbook pro?

how do i turn off the startup sound on macbook pro?

You don't. You may find some third-party software that will, however. Try Auto Mute.
Alternatively, you can try this:
I think this is the best and simplest solution. Open a Terminal window and type (or copy/paste) the following to turn down the startup noise:
     sudo nvram SystemAudioVolume="%00"
Press RETURN.
And to restore it to the original value type:
     sudo nvram -d SystemAudioVolume
Press RETURN.
That's all folks.

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