For its new MacBook Pro at the end of 2016, Apple has not contented itself with wiping out the luminous logo on the hood, the MagSafe and all the ports for the exclusive benefit of the USB-C (and the jack). Much to the despair of its creator and many Mac users, the typical startup sound has also disappeared! But fortunately, there is a small simple manipulation to find this startup sound, here on a 13-inch MacBook Pro with two T3 ports:
The instructions as described by @chaysegr consists of entering a line in a Terminal window:
sudo nvram StartupMute=%00
The Terminal will ask you to enter the password for your user account, then simply shut down the Mac … and restart it to hear that typical sound again.
To return to the “standard” behavior wanted by Apple, return to the Terminal with this line:
sudo nvram StartupMute=%01
It works perfectly, according to our tests. By the way, the macOS login screen is full of interesting and / or fun little tricks to know, we had echoed it here: Tips to customize the macOS login screen.