no start my computrer

Hi

When I start my laptop it does not show any pictures, as it is at rest, but when the screen is raised to 10 cm, while running, but I do not see what's on the screen. When I raise the screen again all extinguished, and this is repeated.

What could be the fault ???

Please, if you can reply at mail: bostjannose@yahoo.com

thanks

Bostjan Nose