Just got my Phantom 2. I can not figure out how to power it up. There is a fully-charged battery in it. When I hold the circular button on the battery for 2 seconds the light in the middle of that button blinks red for a couple seconds, then turns off. Exactly the same as what happens if I turn the battery on when it's not plugged in. When I plug in the USB cable, I also get nothing. Any ideas? Am I missing something?