saftey cable on garage door?

I think what you are calling a safety cable is a way of disengaging the door from the electric drive mechanism so that you can open and close the door in the event of power failure. It sounds to me like this cord(?) has not been properly re attached to the mechanism hence it is not opening/closing properly. I had to stand on a small step ladder to see how mine worked - you may have to do the same! Good luck

Richard
December 2008