Black screen at end of game

I was playing on my other account "PinkViking" the other day... At the end of the game, right when i was suppose to see the score-screen, my Laptop screen went all black with one white line halfway on the top of the screen.

I could not do a thing... not Alt-Tab or Ctrl-Alt-Del

This has never happend before and iv played this game since 2009 beta

My computer is a Lenovo Y50 laptop, with intel i7 and GeForce GTX