Toshiba Portégé: Black screen

Hello,
My laptop (a Toshiba Portégé) is having problems with the screen. I was in the middle of using it when the screen went black, if you look closely you can see that the screen is on. When you restart it the screen works perfectly fine while its starting, however right after the "Windows is starting" screen the screen goes black once again. After looking closely I noticed it displays a message that reads "Your computer was not able to start...."
I was wondering how do you fix this? And why did this happen?
Thanks for reading, hopefully theres a solution to this.