Computer not properly restarted
I interrupted a computer update by closing the lid. Now it won't start up properly. What do I do?
MacBook Pro, iOS 11.2.6
What happens when you try to restart? How far in the restart cycle does the computer get? More information would help.
Startup – Computer Stops or Delays
If necessary, boot to the Recovery Volume (command - R on a restart). Run Disk Utility and select First Aid. Then re-install the OS.