New Phantom 2 pilot... Soft crash into a tree under power. Unit powered itself off, fell to the ground relatively softly - but the battery did pop out. (Which is strange because the battery is very stiff to remove.) There is no visible physical damage. Battery itself powers on normally. But when battery is in the drone and I try to power on, all LEDs on all 4 arms flash VERY briefly - there is a small "plink" noise (from somewhere in the central area?) - then everything shuts down. It's like there's a short causing a breaker to trip. How can I diagnose? And how in the world could a minor crash (NO visible damage) cause a short???