I had the same problem guys... and I fixed it. My first advice is not to charge at all. Let it for at least two days and then the battery will drain off. Then if you charge again your i-phone will turn on, but you have to leave it until the battery drain off '''completelly'''. Personally, I replaced the power button in a certified place in my town, it costed 40euros and the button is new, so now if I have the same problem, I can reset with the known way... Power button and center button simultaneously.