OK so i have had my iphone 4 since launch day and it has been working fine for the most part.. i consider it to be very laggy but thats another story. Anyway, Jail broken the day that was released, but today it just died.. The screen went blank and pressing any/all of the buttons does nothing.. Plugged it in the wall, nothing - plugged it in the computer, nothing... Should I take it into AT&T or what (there is an AT&T store in my town but Apple is an hour away)? I am scared that they will discover it was jailbroken and charge me for a new one. Thanks, Richard.