Screen is Blank

Your computer screen is turned on and it has a light on to confirm this. But your screen remains either black or blank but with some kind of back light.

The monitor or screen may have been damaged by electricity or it could be the graphics card which what your screen connects to in the computer. A laptop screen and a standard PC screen are very different in their makeup and repair options. In any case this is a workshop job and needs to be diagnosed quickly so you can decide the best course of action.