I recently purchased a Vision + off of EBay that was advertised as "new in an open box". It appears to be in new condition. However, when I insert a fully charged battery into the compartment and press the power button once and then hold for two seconds, all four green lights come on but nothing happens. I've had a Phantom 1.1 for over a year so I'm not entirely new to this but before I contact the seller I want to ask as see if I'm doing something wrong. Thanks.