I updated from Windows 7 a few day ago and Windows 10 worked fine. On Tuesday night I updated the driver for the NVIDIA graphics card.
At one point the screen when black with only a mouse cursor. This happened before with Windows 7 but it always came back. After waiting an hour nothing changed. I couldn't do anything.
Rebooted and got the same screen after the Windows start up screen. I could not login as far as I can see. I can't start it in safe mode since that requires the screen.
Since I was using a dual monitor, the laptop monitor and an LCD monitor connected to the hdmi port. I tried booting without the second monitor. It this case I get a single pixel blue line on the right and bottom of the screen. Occasionally, when I move the mouse cursor to the right of the screen I get a blue ribbon just like in Windows 8, but with nothing on it.
My Dell laptop come with facial recognition, which has not been configured. This may affect my login because I need to select with the mouse that I want to enter a password.
The upgrade to Windows 10 is not the issue. The issue is with the video card driver from NVIDIA.
I have found instructions that doing Shift-Restart from the login screen will restart in safe mode. What I need, and can't find anywhere, is a keyboard shortcut that will allow me to restart my laptop in safe mode from the login screen.
Alternatively, to tell the Dell Facial recognition software to let me enter the password could also work, since I will to do the restart once the desktop is active.
My computer is a Dell XPS 17
8GB of RAM
Windows 10 updated from Windows 7
I do not have any boot media.