When doing testing it's important to know that the extruder on 90% of printers out there will not move the extruder unless you either enable "cold moves" or heat the nozzle above a certain temperature (I think 170F).
This detail made me think my stepper was broken for a while but it was fine.
Anyway - assuming that's not the problem - it's probably one of the 4 wires that go to the stepper. If any of the 4 wires is broken it won't rotate. Disconnect the stepper from the PCB and measure the resistance of each pair. Each pair should have a resistance of < 24 ohms. Quite a bit less. And the pairs should be isolated from each other so measuring resistance from a while of one pair to either wire of the other pair should be infinite.
I suspect there is a broken wire almost certainly at the stepper end or at the PCB end.
I have tried every firmware I can get my hands on and no difference
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