If you troubleshooting a Touch Bar that has stopped working on an Late 2016 MacBook Pro, where the Touch Bar is completely black, try these steps to restore functionality:
- Create a new local user account (to use temporarily for steps 2-4)
- Reset the NVRAM
- Log in as the new user
- Log out then log in using the primary account
- Assuming the Touch Bar is working, delete the user account you created in step 1
I’m not quite sure why creating the new account and logging in with it after a NVRAM reset is necessary, but this process is what Apple support is walking people through who are experiencing this problem… and many people have reported it works.