MacBook Pro crashes halfway through start

Welcome to the Apple Support Communities!

I understand your MacBook Pro is not completing the startup today. Has anything changed since yesterday? Do you have a Time Machine backup of your computer?
About the screens you see when your Mac starts up
The first thing I would suggest is to disconnect all peripherals except your keyboard and mouse, and then press and hold the Shift key as you turn on your Mac to see if it will start up in safe mode.
Use safe mode to isolate issues with your Mac
If the computer starts up in safe mode, then restart the computer without pressing the Shift key to start it normally.
If the computer does not start up in safe mode, then you may need to start up in recovery mode and use Disk Utility to check the health of the hard drive.
macOS High Sierra - Repair a disk
Branna1, give these initial troubleshooting steps a try, and reply to this thread with any additional information that you can about your issue. I'll do my best to help you with this!
Take care.

Find Locations - Service - Apple Stores and Apple Authorized Service Providers
All the best to you.

Hello,

Try to reset the following;

SMC reset

PRAM reset

NVRAM reset

Here is a link with specific details;

https://www.google.gr/amp/s/www.macworld.com/article/2881177/macs/how-to-reset-y our-macs-nvram-pram-and-smc.amp.html