Hello! I got a Phantom 2 Vision from a friend, and this morning had my first flight, which went very well. All was fine, and when I noticed the battery was getting low, I packed up and went back home, to charge the battery. When the battery appeared fully charged, I put it back in the Phantom, and since then -- it won't power on!!! Well, to be exact, after many attempts, it turned on once while it was connected by USB to the Assistant Software, and so I was able to successfully download and install firmware 3.6. Then, it asked for a power cycle, and has not turned on since :-( The battery looks fine, 4 green lights, perfect life left, etc. Only when I press for 2 seconds, nothing happens. Nothing at all. I tried with a spare battery, also fully charged, and nothing happened. Any ideas??? Thanks!!! And attached is a photo taken this morning on my successful flight, to show that I am not completely useless and I do know how to turn this thing on.