Windows 10 black screen after update.

I was using my laptop last night and got off and decided to go to bed. At this point it was still working fine. When I woke up, it was installing an update and I decided to let it finish. After the update was complete, it went to a lack screen, which I thought was weird. So I restarted and it went to the boot screen, which leads me to the problem I've been having since. It would show Lenovo and the boot screen until it would blink to black a few times before showing me the boot screen for some more time at a lower frame rate until the screen would appear black. I can still use everything and even log in and hear the skype startup sound. Everything works fine. Is there an easy fix to this or should I wait until the next Windows update?

I have lots of progress on the computer that I cannot lose. I do not know much about the inside of a Lenovo ideapad z510 so I could not take out the battery. I am desperate and have tried anything and everything online. Something has to work.

Thanks in advance. Any effort is hugely appreciated.

Also, Windows 10 had worked fine ever since I got the upgrade. I got the upgrade the first possible day I could and it has been fine. It has just been occurring since this one update last night.

Having the same problem since the last update, upgraded to windows 10 months ago worked fine, no issues at all. Then windows did a huge update almost a week ago, and now when I try to start windows, the windows symbol appears, the circle spins once or twice and then stops and I get a black screen. If I hit ctrl I will get my usual screen just before I sign in, but the screen is frozen and it goes right back to the black screen, restarting my PC fixes this and I can login normally but its still frustrating.