My MacBook Pro will not start up

Hi,

Resetting SMC could solve the issue.

How to reset the SMC of your Mac - Apple Support

If it doesn't help, contact Apple Support or make Genius Bar reservation if your local retail Apple Store is open or find opened local Apple Authorized Service Provider to be examined your MacBook Pro.

Official Apple Support

https://www.apple.com/retail/geniusbar/

Apple - Find Locations - Location Selector