A
AC Question
when i hold down the power button, it shows galaxy s4 screen then goes blank. Ive tried power,volume down and menu . Pressed volume down when it asks to reboot and it goes blank again. ive tried power,menu and up volume and nothing. Ive tried using Kies, kies 2.6 and kies 3 to update firmware and it will not work. When i put in model number it says please enter model number etc when i press enter on computer