Windows 10: blank screen after installation win10

Can help for the solution for this. It is working fine with 8.1 windows Lenovo b540 all in one pc. after installing win10
screen came up ( installing 45 min) and gone screen blank. Switch on but boot up screen noting.

:)

 

Blank Screen at the process of installing Windows 10 and after about 60% complete.

Original Title: Blank Screen After an Hour

I'm in the process of installing Win10 and after about 60% complete, my screen went blank and nothing has happened for an hour. The computer is on but nothing is happening. What should I do? Should I try a hard shut down?

 

Video issues with Windows 10- Blank screen

I have a custom system with an Asus motherboard and an NVidia 670 video card. After downloading and installing Windows 10, I discovered that the computer boots but to a blank screen. Not a black screen, but a blank one. It appears that a signal is being
sent to the monitor, but that signal is blank. The monitor never goes into screensaver or power saving mode. However, the "flash" screen (with Asus logo) and the Windows splash screen both appear prior to going blank. My guess is that I forgot to upgrade
the video driver before upgrading to Win10. Has anyone else had this issue? What fixes did you use? I have been forced to restart several times to no avail...including after using the repair function, and it always goes back to the black screen.

 

If i go to screen 2 button( tv) screen works fine ( dots on the full screen )