Send that to someone who fixes watches. Maybe all it needs is to get cleaned. If the buttons are working then try reseting this way. (1) Press and hold the Power key until REBOOTING displays at the bottom of the screen. (2) Press the Power key repeatedly until the Select REBOOT MODE screen displays. (3) Press the Power key to highlight ' Recovery'. (4) Press and hold the Home key to select. (5) Keep holding the Power key until the Gear S3 begins rebooting.