Newly assembled ender 3 pro extruder motor doesn't run

  • I just assembled the ender 3 pro precision with no problems. No mods were done. After assembly I tested it to check the motors. THE XYZ all work as expected. When I select the Extruder the motor doesn't run. Yes the extruder cable is plugged in properly to the motor. There are no cuts or nicks on the ribbon cable. I do notice a vibration in the motor when I try to run it. Any suggestions?

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