I can't touch my screen. It doesn't recognize my pen, too.

I've been using it for only a couple months, and I slightly, very very slightly dropped my 2-in-1 at a very low level just once.(It was about a week ago.) And yes my tablet and my keypad got separated but still, it wasn't serious. And my laptop worked just fine till yesterday. I turned it on, it worked. And after I put it to sleep and came back after dinner, it stopped working. Need some help here! ( I tried restarting it.)