Device is unresponsive to touch

I would recommend attempting to or having a repair shop attempt to re-seat the ribbon connection cable for the screen. There is always the possibility that it came un-seated during a fall or hitting the bed to hard as you drop it onto the bed, something random like that and it just needs to be pushed back in all the way. If that does not work, you may need a screen replacement. Sucks to hear but sometimes there are just faulty screens and they can give out at anytime. Hope it all works out for you and hopefully its just the cheaper option of re-seating the ribbon cable.