There are signs that indicate your garage door needs to be replaced. These include:
Large dents and dings on the garage door.
Cracks in the exterior of a metal garage door or surface damage on a wooden one.
Warped doors that do not close properly.
Inability to open or close your garage door from either inside or outside.
A door that opens up if you let go of it or falls down on its own accord.
An automatic garage door opener that no longer works.