A quick check of the springs, pulleys, and cables will tell what you need to know. To check for a broken torsion spring, look at the springs on either side of the drive mechanism. A broken torsion spring is easy to spot as it will have become separated from the chain, belt, or screw drive mechanism.
If you’ve broken a cable, it will probably become wrapped around its pulley or the roller bar. You will find the pulleys on the end of the roller bar above the garage door tracks.
A qualified garage door repair technician should repair either of these problems.
Torsion springs require specialized tools and knowledge and can cause serious injury if you don’t know what you’re doing.
The cables are not as difficult to repair or replace as the torsion springs. However, it might still be a good idea to have them fixed by a qualified garage door repair professional. The amount of tension required by the torsion spring to operate the garage door can be dangerous for average homeowners.