dropped phone now boac

Dropped my 16 GB iPhone 4S which has IOS 7.1.2 installed and bent the corner of the phone. Everything seemed fine but after a minute or two the screen went black and started having blue vertical lines on the screen. I can still use Siri/Voice Control and play music and hear notifications. I have tried the hard reset but nothing happened, if i plug it in to charge it it will charge and make the sound. Please help me.