Why is my screen black when turned on?

This happened to me yesterday and i tried looking for ways to fixing it. The whole take off battery, press on button for 60 seconds put ac adapter cable , & turn on. I read too to stop "explorer.exe" on task manager from running so i connected my pc to the tv and did it. It still wasnt working so i just put the laptop away. Then after about an hour, i tried turning it on and it actually turned on and the screen seemed fine and i thought it was fixed. Now i just tried to turn it on and its happening all over again. Please help!