XPS 15 L521X

Put laptop to sleep last night and found it today with a black screen and a movable blue loading cursor. It does not respond to holding down the power button, any keys including F12, F8, ctrl + shift + escape, or shift sticky key.

I've unplugged it until it died and booted back up multiple times, all I get is the Dell logo and then black screen with cursor. Looked like there may have been a pending Windows 10 update last night, could that be the issue? 

I'm pretty stuck at the moment, any suggestions? Thanks.