my phone, "Lenovo A319" wont turn on . even if I press the power on button for long period of time, it still wont turn on, what should I do? I tried charging it, the charging symbol pops out, but then its not moving... then I tried pressing the power on button, while charging,''' it just wont turn on... what should I do? please help me! the battery is low when I go to sleep, I decided to charge it at morning, then it happen it wont open....