Can you, please share what steps have you performed to resolve the issue? Did you connect your laptop to an external monitor to see if it will give a signal? If you did, then could you see something on it or not?
If you didn't, then the problem that you have may be due to the failure of the video chip. Sometimes, after much of a use and less cooling the graphics processor, which is responsible for video signal transmission get unsolders, the thermic paste goes away and it gets unsoldered, therefore the screen doesn't show anything. If you possess knowledge of notebooks' hardware you can change the paste yourself by opening the laptop and check if the chipset that is next to the processor has got unsoldered or you can bring your laptop to a technician to get it soldered again.