If you take the screen's frame apart, usually six to eight starhead screws located beneath little 'buttons' on the face of the frame, you will gain access to the rear of the screen itself, where you will see a cable, coming from the main body of the laptop, that is attached to the back of the screen. Check that cable's connection to the back of the screen.
whurley not sure what you mean by an inverter - The only inverters I know of are small electronic printed circuit boards that convert a dc signal to an ac one. What I am talking about is the illumination for the screen. The normal screen lamp is a thin electric lamp the length of which is about the width of the screen.