I FOUND A SOLUTION!! (the paragraph bellow just explains my situation) I have an iPhone 5 with a lock button that doesn't work. One day I woke up after a night of it charging and it turned on just fine. The next second, it turned off and wouldn't come back on with the home button. So I plugged it in and nothing happened. Of course I couldn't reset it because my lock button doesn't work. So I decided to try something... I left my phone unplugged all day. And then all of a sudden the symbol to plug it in to charge appeared so I plugged it in and now its fine. p.s. the symbol came up right after I touched the screws on the bottom with a metal screw driver (not sure if that had any affect)