Toshiba booting normally but black screen. Using flash light to

Hello,

Toshiba booting normally but black screen. Using flash light to access the files inside.

My Toshiba satellite pro U500, is having problem with black scree. It is booting up normally with normal windows 7 boot up sound. But the light from the screen is not on.Normal icons are displayed but I could not see clearly as it is black. I have been using a flash light on the screen to access my files. And currently iam only using the flash light to see the icons at the screen desktop.

Please help me.

Thankyou