How can I fix a garage door opener?
+1
How to fix auto garage door opener ,the cable in the track is rolling but the door won't lift up ,does it need greased?
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Could be any number of reasons. How often do you have serviced?
https://dengarden.com/garage/5-Most-Common-Reasons-Why-Your-Garage-Door-Wont-Open-in-Phoenix-AZ
https://customoverheaddoors.net/reasons-your-garage-door-wont-work/
https://www.bobvila.com/articles/garage-door-not-opening/
For $70 you can have it professionally fixed & totally gone-through.
Please be careful anytime you're working on a garage door opener! If those cables snap they can be deadly!
Sounds like the cable has detached from the door. SERIOUSLY DO NOT TRY TO FIX THIS YOURSELF. As Susan said, if the cable snaps, it can injure you very badly and can even kill you! Please call a professional service for it!