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The safety cable is a long metal cable that supports and holds up the door's weight if one of its springs suddenly snaps. They serve a safety purpose only, as your garage door is not meant to function without its spring, and you should avoid operating it until a professional has dealt with the issue
Garage doors are too large and too heavy to be handled by home owners alone. You can contact our professionals in Pecan Grove if you wish to replace your door. They are skilled in this field and surely, they can finish the job in no time.
Broken garage door springs are obvious. You'll see them hanging in separate pieces. If you want to check their condition, disconnect the opener and attempt opening the door manually. If the door is moving with difficulty, the springs are damaged. If it bounces and moves up or falls down instead of standing still, adjustment is required.