Windows 10: How can i fix black screen after logging in?

When i booted up my computer today I had a black screen but still had my mouse. I have tried many different things and a lot either don't work, couldn't help me. or for some reason don't allow me to. When i try updating windows it fails, I can't use administrator in command prompt as i don't have permissions for some reasons, and can't open task manager. Every time i tried troubleshooting settings they either didn't work or nothing happens. I don't know why suddenly this happens but every time I boot it back up and sign in I get the black screen and have to wait a few minutes. I also keep gett

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Black Screen after Log on


Computer boots to windows log on,have no password here.After a minute on log on it go to a black screen,stays there forever. I can get to Task Manager from black Screen,lost on what to do next. Just want my Windows 10 back, not sure what caused this problem. Any Suggestion on what my next step should be?*Sad

 

Black Screen after Log on

So this is not a BSOD ? Have a Windows 10 disc or USB Flash Drive made ? How are you getting to task manager Ctrl.+Alt+Del ? Any cursor on screen ?

 

Black Screen after Log on

Laptop or Desktop (Very important) Windows 10 build 14.586 has a very annoying BUG: That causes Black Screen after login:
To date there is no cure until Microsoft send Update to fix the problem: OK here goes: When you Login and the Screen Goes Black ==>
Go to your Function Keys for Screen Brightness Chose to Lighten the Screen (This will make the screen Bright) so that you can view it.
The BUG is that they reversed (via Software) what the Brightness button does -- So it is currently reversed -- "Lighten" makes it Dark -- "Darken" makes it Bright ==> Go figure Microsoft screw the pooch on this one. . . .

This is for LAPTOP -- I have never seen this on Desktops but they are fixed rather than adjustable