1

I have tested the motor and the cable, they work fine.

But when I try to move the extruder on the printer, nothing happens.

And I did preheat before I tried.

Could it be the board or what could it be?

2

well, this description is like “My car wont run, why?”
You need a lot more detail to get any kind of good answer.
But, YES, it could be something!