I dropped my S4 last night by accident and although there is no damage to the phone or screen (i.e not smashed) when I press the side button to unlock it, the screen flashes like a weird yellow quickly then stays blank. However, the buttons at the bottom are lit up and as I have a password on my phone, when I run my finger along, as if I were unlocking it, it vibrates the same as if the screen were working. Anyone know what it is?? & How much to get it fixed?? - No I dont have any insurance