i hvae tryed evertyhing from new battery to new charger. my z10 only sign of life in a red LED light when i connect the charger but its weird becuase the light only comes on why i take the battery of and keep it connect it. people have advise me that it might be a software glinch and this happen to me maybe a week after i installed 10.2.1 and i charged it with a motorola moto g charger and not its original charger.