My phone turned its self off the other morning with about 91% battery now it wont turn on. I plugged it into my charger and it turned on but now it wont lock? i reset the phone (by holding the lock button and home at the same time) and it begins to reset but then has the picture of the apple logo then it goes blank then comes back to then go blank again it will not turn on then until i plug it back in? Please Help i need my phone for everything:S