my 3g on 3.0 is not responding to being plugged in, whether it is on the computer, the wall, or my car. the phone charges, but it does not show the battery on the lockscreen, and the battery doesn't change it the upper corner. nor does it beep/vib. i noticed it started doing this while i was JB, but even after a full restore, it still doesn't do it. does anyone have any ideas?