Did you check all the cables?
Maybe the motor connector was loose and lost it's connection. Also check that the cable sits on the connector properly (these are crimp connectors, they may pop out of the connector when you pull on them too hard or even when you plug in the connector)
Then, there's the stepper driver. Check if it's connected the right way. Try switching the stepper driver with another driver. If another motor stops working then - you got your problem.
Also check the motor cable carefully if there is no damage. This may be a little tricky if you don't have a multimeter. But often you can see if there's damage if you look carefully. If there is any visible damage (broken insulation or cable flattened), you should switch out the cable (if possible) or the whole motor (if you can't rework the cable yourself).
If you don't find the problem, check the extruder mechanics. Maybe they're blocked.
If everything fails (and no one else has any more suggestions) you'll have to switch out the motor with another one. No need to put them back in the machine, just connect the extruder motor to another port on the UM and see if it works. If not, you probably got a damaged motor.
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mostlyatomicbob 34
A couple of things to try here:
First preheat to 210 deg. then try turning the gear wheel on the extruder by hand. if you cannot then it might mean that your nozzle is blocked.
there are guides in the wiki to solve blocked nozzles.
also check the connection from the extruder motor to the electronics underneath the UM
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