Installation problem with windows operating system

Hello everybody!
I had just recently formatted my computer from windows 7 into windowsNT2000. During the installation everything was fine and dandy. I installed all the drivers and updated everything, after a lot of resets from all the installations of drivers. When I finally got to install the last driver, my computer restarted one last time. But when it was booting up the whole thing suddenly just went black. No display or anything. I checked to see if my computer turned off, but when I checked it the fan was still running. What’s wrong with my computer?
