Q: Why won't my MacBook let me log in

Hey Kkamahoa,

Sorry to hear that your MacBook Pro is not booting all the way up so you can log in. Let's see if we can get you back up and working. 

Start with booting up your Mac in Safe Mode. You can do that by holding the Shift Key while powering on you MacBook Pro. If that works, you should be able to restart your Mac and it should load up like normal. 

If that still does not work, try using Disk Utility to verify your hard drive by booting up to your Recovery HD or installation disk. Take a look at the article below for more details on how to resolve issues with booting up. 

Resolve startup issues and perform disk maintenance with Disk Utility and fsck
https://support.apple.com/en-us/HT203176

Take it easy