Windows 10: Windows 10 Black Screen only Mouse Cursor

Where do i begin. So about 3 days ago my PC was working completely fine. I started it up and before the Windows 10 Sign In.... nothing. Black screen, no desktop, no welcome screen, nothing. If i move my mouse it appears and that's it. Just my mouse and an empty void. Ctrl Alt Delete doesn't work, can't open the registry edit, i can not interact in any way apart from moving my mouse around. Thee blue loading ring is having a fit next to the cursor and that's really it. Leave it for an hour and nothing. Now here's where the real problems come in. So i access the advanced Windows Startup and i will just cut to the chase. I got my PC made from guys at UKGC (UK Gaming Computers) ages ago and have been using the default account named well, UKGC. Never had to enter a password but now it's asking for one. Weird because i never set up a password. I even emailed the about it and they don't even know what it is. So that's where i am, I'm desperate for help. Thank you.

:)

 

Black Screen with working mouse cursor but not keyboard

It is frozen or just black screen in Safe mode ?
might try to repair Windows by an installation DVD or a USB stick

 

Black Screen with Mouse Cursor with continual repair loops


Next I did select volume and list volume X:

 

Black Screen with Mouse Cursor with continual repair loops


Next up is bcdedit | find "osdevice"
And after doing diskpart , list disc