Geeetech

I think that I have a problem with system board. Problem is in the extruder step motor. The motor doesn't spin when is conected on extruder port (I checked the motor on other axels and it worked).
What do you think is problem?

I'll ask the same question every time someone had the same issue as yours:
Did you heat your extruder before your test?
If you did,check the following post:
viewtopic.php?f=19&t=17097