Today, my phone felt very warm, so I shut it down. I waited about 15 minutes. When I tried to power up, the phone flashed the Motorola logo and went dark. I tried repeatedly with the same result. The battery had power when this started. My next step was to plug the phone into a charger. Now, the screen blinks on and off, showing the battery outline with a white zigzag inside, as if it were charging. However, the screen does not show any charge is loading. The screen also does not display a red line indicating the power level is low or absent-- only the white battery outline with a white zigzag. Any advice would be appreciated.