My Samsung S4 mini is not charging. At home I only have 1 cord, tried two different electrical outlets. Plugged in over nite, nada. Brought the phone and my cord in from my car, plugged in here at work for over 5 hours and still no charge. Thoughts? The phone acknowledges that it's plugged into the charger, but it's not charging at all. I can turn my phone on while it's plugged in. Once it's unplugged, the phone shuts down.