macbook pro 2019 w touch bar not turning on

Troubleshooting Mac Startup or Power Up Problems

What to Do When Your Mac Won't Power Up At All

Have you tried booting in Recovery Mode:

1. Restart the computer.
2. Immediately, at or before the chime, press and hold down the "COMMAND" and "R" keys together.
3. Release the keys when the Apple logo and progress bar appear.
4. Upon completion the Utility Menu should appear.

If the above works, then try booting into Safe Mode:

1. If your Mac isn’t already shut down, then shut it down and wait at least 30 seconds before rebooting.
2. Immediately, at or before the chime, press and hold down the SHIFT key. 
3. Release the key after the Apple logo and progress bar appear.
4. Safe mode startup is much slower than normal startup, so be patient.
5. When the Login Screen appears enter your admin password.