Hi, I am total new to this. I don’t even have own one yet. However I was given an older Phantom 2 to look at because it is not working correctly (blades wont startup) and I work with electronics. A co-worker has much experience with these drones went through the basic and advance calibration procedure but it did not help. The only response from trying to start up is one of the blades will wiggle back and forth two or three degrees when the other three don’t do anything. Only one-other thing that I noticed was 2 screws from each arm is missing believe for holding the blade guard.