I have a IPhone 5s, I did drop it at school and it cracked. I had it charged to 100% and it works fine when on the charger but i took it of the charger to go to school, then when i took it out 1st period it wouldn't turn on so when i got home i put it on the charger and the battery dead symbol showed up then the apple symbol on a white screen then the screen turns black then back to the battery dead then the apple symbol then black and it does this over and over when its on the charger but if you unplug it it just turns black and it wont even turn on. PLEASE PLEASE PLEEEEASE HELP!!!!!!