The most basic garage door repair involves diagnosing the problem and then coming up with solutions that uniquely address the installation issues. Inspect the moving parts that constitute the hardware in order to ensure that they are functioning as intended by the manufacturer. These parts include cables and springs…two of the most important parts of a garage door. If there are signs of breakage then you may need to seriously consider the possibility of replacing the parts that are affected. Often this is the cheaper option. It is certain that the moving parts must be lubricated. You may use an aerosol spray for this purpose or alternatively work with a wand. Do the same for the hinge and rollers. Make sure that the lubricant is regulated otherwise you will end up attracting dirt. If it is a modern door then you should not forget the electronic motors or sensors which are critical.