Hi Kitty
Welcome to PC Help Forums
Well it looks to me like the screen panel lighting bulb as died which can be expensive to replace.
To make definately sure, hook it up to an external moniter, if you get a picture you know it's the screen.
One last thing, and I suppose you've tried this anyway, is crank the brightness up. If that does not work well...........................

Sorry
P.S. Your programs, Folders etc will all still be there don't worry on that aspect.