For most homeowners, a garage door is a mechanical mystery. You press a button, and it opens. You press it again, and it closes. When this simple ballet of springs, cables, and rollers is disrupted, the problem looks out of nowhere. A grinding noise, a sudden stoppage, or a door that won't close can be alarming. You know something is broken, but you don't know why, or what it takes to fix it. A professional doesn't replace a broken part; they follow a careful and safe process