THE MC LAUNCHER AND THE BLACK SCREEN

So on 5/29/13 My MC was working completely. The next day I open my MC launcher and press login. It seems to work then it goes to a black screen. So I force update. After the update says Done loading it went back to the black screen. I took the browser and move it. It copys the things i put it over. And frozen I am about to stop playing MC dont make me go to that point. HELP PLEASE I NEED TO GET THIS FIXED