Background: Bought this from a person who crashed it. crash broke the cable on the gimbal and messed up a motor. I have replaced the cable on the gimbal and replaced the motor. It works perfect, as long as it doesn't have cables connected to the gimbal. In fact, it's only one of the cables that causes the problem. It's the cable opposite form the one that "clicks" in. When it is not plugged in, no errors. When it is plugged in, the lights on the arms off the quad turn off and a little red light on the right side of the quad blinks red. There is no movement or anything of the gimbal itself. All firmware is up to date. I have tried unplugging them in, checking that all the wires are connected well with no messed up pins. I have not messed with anything up above in the quadcopter regarding this issue. Note: When the gimbal is connected, along with the flashing red light on the side of the quad, there is an error that pops up in the software (abnormal compass data) This only comes us when the gimbal is attached. once I unplug the gimbal, it goes away. Thanks for any help!!! BTW, I tried searching 20 mins through quite a few posts similar, but I could not find the same problem. So sorry if this is a repost.