Apple decided to kill off the startup chime from the new model of MacBook Pro, which aside from being a mainstay on Macs for years, has also always helped troubleshoot boot issues. Thankfully, you can get the sound back with a Terminal command. All you need to do is open up Terminal (Applications > Utilities) and enter this command:
sudo nvram BootAudio=%01
This will being back the startup sound, along with the assumption that it should also still help you troubleshoot any issues.
Re-enable classic OS X startup chime in 2016 MacBook Pro [Windows Clan
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