Laptop shows black screen

I have just made my laptop (Medion Akoya Windows Vista) and then back on. Since then he does not drive up anymore, but all the lights shine only black screen to see. Laptop makes running noise, that is, when it is on, as normal as ever. Battery was also full of trying to charge, the lamp he indicates. But only black screen. I do not see anything on the screen, the laptop goes on but does not show anything.

What do I do, can't be that a laptop is so suddenly broken.

Connect an external monitor.