I dropped my S4 the other day and cracked the glass but it continued to work. A few days later I picked the phone up and hit the side button to bring up the display and now all I get is a flash and the screen remains black. Rebooted, pulled battery and still does the same. You can still hear emails coming in and when I get a phone call I can swipe the screen and take the call but it remains black. The only thing that lights up is the led and the menu and back button. I took it apart looking for a loose cable but saw none. Any ideas? New digitizer?