Hi, Bought a used Dji Phantom 2 yesterday, and ran into some problems. Been reading a lot on the internet but can't seem to find anyone having this problem by just inserting the battery. It's not my first quadcopter, but my first Phantom/Dji product. As soon as I insert the battery it starts constantly beeping, which getting louder and a bit faster when I don't pull out the battery. None of the lights gets lit, and It will not connect to computer using the Micro usb port on the front. Battery got 50-75% charge, and when I insert it and try to turn on while beeping it just works like if I pressed the botton once. Yes I press once then press again and hold for 2 seconds ( Tried to hold for a long time also ). I've tried to look over all solder joints and they look fine. All motors are beeping. Not sure if it's the battery or flight controller. But I really don't hope the fc is fried/dead. Will try to add a quick video to show the beeping. Thanks in advance, and please excuse my english had to write this in a hurry.