and while u'r under there tapping on stuff ,, try tapping on the motor ,, and see if that helps ,, sometimes the brushes get on a spot that will not let the motor run ,, i have done this to mine a few times ,, but eventually the step motor will need to be replaced ,, if the tapping makes it work agian ,, also ck the door swtiches ,, they are contact type ,, u should have one on the door frame ,, and one on the door ,, the one on the door is nothing more then a magnet ,, and the one on the frame is kinda like the reciever ,, if either one is broken even part of them ,, u'r step will not work , but do as others have said ,, ck the grounds and all the connections ,, specailly as hollis said ,, "the ground" but let us know what u find