Macbook pro will not start after black bar under apple is completely filled

About the screens you see when your Mac starts up - Apple Support

Try Booting into Recovery (Command R) and from the dropdown menu: Utilities> Disk Utility> run the First Aid on your Macintosh HD


Recovery http://support.apple.com/kb/HT4718

One possibility is a corrupted boot volume, where it's getting stuck because there's some critical OS file that's missing. I've heard of it possibly stalling indefinitely, shutting down (that happened to me), or restarting. It's almost always at the same point on the progress bar.

Running First Aid from an external boot drive (if you've got one) or from Recovery HD or Internet Recovery might fix the problem, but isn't guaranteed to.

About macOS Recovery - Apple Support

Do you have a backup? Worst case scenario is that everything is unrecoverable and the only practical thing to do is reformat the drive and start over with a clean OS install. Also - what model MacBook Pro?

1. Boot and hold CMD-R to start up from macOS Recovery
2. If Filevault is on, mount the disk with Disk Utility and enter password
3. Enter these two commands in Terminal

4. cd /Volumes/Macintosh\ HD/var/db/caches/opendirectory

5. mv ./mbr_cache ./mbr_cache-old

6. Exit from Terminal
7. Restart the computer

Does your charger show green or amber—this would indicate you have power. If nothing is indicated at the magsafe light, the battery is dead and no AC from the power brick.

If that is the case then the best you can do is take it in:

In or out of warranty you can get a free over the counter 'Apple Service Diagnostics' test

Genius reservation http://www.apple.com/retail/geniusbar/

on-line https://getsupport.apple.com/

check warranty https://checkcoverage.apple.com/

early or late 2011? which model MacBook pro from 2011? 13-in, 15-in single graphics, 15-in with Dual Graphics?