I sat down on a couch tonight and my phone slid out of my pocket and fell on the floor. It only fell about 2 feet. When I picked it up, it was powered off. It would do this sometimes when I would put it down on a hard surface. It shuts off, but always powered back up when I hit the power button. Well, this time it wouldn't power back up. I tried removing the battery and cards. I tried the "power button/home key" trick to reboot and nothing. When I plugged the charger in, the keys at the bottom, flash on and off, so it appears to be getting a charge, but it won't turn on. Is there anything else I an try to get it to turn on?