Earlier today my phone fell, but it wasn't from very far of the ground and it has a cover so I assumed the phone was ok, but when I checked it, it has no cracks or any damage whatsoever, but the screen went blank. The app switcher key and the back key turn on when I press the home screen and I can see the LED light flashing because of notifications, but the screen is blank and there's no haptic feedback when I press the keys, even if they are on when I press them. What should I do?