To rule out the possibility of it being a setup error try the following: This is a standard procedure for all 4 in 1 recievers. You must set your throttle trim all the way down, and set your throttle all the way down too, then connect the battery to the reciever and wait for the 4 in 1 to arm. Obviously if the heli goes mad then throw the reciever at the guy who robbed you!