MacBook stuck on black loading screen
When you don't get to a blue screen in the boot process, you can assume an OS reinstall should fix it. Your fsck results reinforce that as next step. 

I would boot to Internet recovery and download the OS installer of choice if your Mac supports that. 


https://support.apple.com/kb/PH22136


When that is done, next is


https://support.apple.com/kb/PH21900


That article has the reinstall steps linked at the bottom.