Pluuged my iPhone into a wall outlet last night to charge up. When I got up this morning there was a red low battery icon on the screen. Unplugged it tried to turn it on and nothing. Tried plugging it into my computer for a bit...nothing.... Tried holding down the hone and on/off buttons at the same time...nothing.... All that shows is that red low battery icon when its plugged into the wall or my computer. Any suggestions??