You might turn your computer on and have the dreaded black screen.
You can try removing your video card and using onboard video, or replacing the video card to see if that is the problem.
A computer black screen on start up is a challenge for me and I always try to trouble shoot the problem manually, without using those fancy programs, because I believe it is the only way to learn.
There are two types of computer black screens that can appear in Windows.
This is the simplest computer black screen you can get.When I know that my computer is showing a on my Windows computer and I know that I have just connected it to a different monitor, I immediately restart and press F8.This will take me to the the menu where I will choose enable VGA mode or something similar.People often also see a computer black screen when they have plugged their computer into a different monitor or even a TV where the screen resolution is not compatible.If it is a simple black screen on your computer it can also be a simple problem to fix, but unfortunately people do not realize this problem and start troubleshooting, which actually gives the computer are serious black screen.