Have you ever tried to lift an old garage door, or a garage door with broken springs? If so, you might still be suffering from back issues. It’s no easy task! If you have a garage, you might go in and out of it several times a day, the garage door rolling up and down over and over.  Stop for a second and think about what makes this seemingly mindless contraption work.  Your garage door is a complicated machine made up of many working parts, each essential to the smooth, unhindered movement of something so cumbersome. Part of that mechanism involves garage door springs that are under a huge amount of pressure and do the actual lifting of the garage door. Because these springs are under so much tension, if one were to break, it could cause serious damage or injury. Thanks to a heavy cable that runs through the springs, preventing them from recoiling, any danger is limited. However, if that cable were to break, you have a serious potential problem.

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Insert a lightbulb into the socket in the garage door opener compartment, if it has one. The manual or the inside of the compartment should suggest an appropriate wattage for the lightbulb but it's a good idea to buy a lightbulb that is rated for "rough service" because of the vibrations it will need to withstand.[5] The light will turn on whenever the door is opened but may be able to be operated manually as well. 

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Inspect your garage door cables often for fraying or kinks. Don’t forget to inspect the pulleys as well, as they can get worn out. If you find an area that is frayed, follow the cable’s path to see what could be causing the damage. There might be something sticking out that is damaging the cable, and you can remove the protrusion before it causes further damage. Keeping your cables clean is important to their health, as well. Remove any debris and keep your cables free of lubricants since they can attract dirt and grime, which can eventually cause your cables to stop working properly.
Given the complexity of a garage door and opener system, there are a variety of different areas something could go wrong. If your garage door shakes or is very loud during operation, the garage door closes all the way only to immediately open back up, the garage door opens slowly or closes too quickly, or the garage door opener and remote aren't working at all, you should seek help from a professional garage door repair specialist.
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