I have just bought a second hand dji 1.0, and cant get it to work.... I turn on the controller. connect the battery on the drone, The lights flash and after about 2 mins I get a steady green flash maybe with the odd red flash, which I understand is ok. I have it set on gps and the other switch in the off position. Once all this is done and I am redy to fly I can not get any of the motors to start up!! I pull both controls down or to the centre as they say to on youtube and no joy.. If I turn the control off I can see a small red light inside the drone come on and then as soon as I turn the control back on the red light goes out.. Please can anybody help?