Have you tried booting into recovery and doing a factory reset? You can boot into recovery in most phones by: Starting with the phone off, hold the power on and the volume down button until it boots into recovery mode, from there, look for the option for factory reset. This will wipe all of your data but in most cases it can solve an non-boot phone. If that button combination doesn't get you into recovery, try power and volume up or any other combination until it works.