I have the arducopter kit with all the stock equipment.   I just finished configuring the RX/TX in the conifgurator and everything worked perfectly. I know I have RX power because I have a red light on but I cannot arm the motors at all.    I unplugged the copter from the usb and put a LiPo on.  The boards boot and the Green light is solid.  I get no RX TX light, but when I turn on the TX the PPM…