Are you connecting to your PC via cable or wifi? As when you connect to it via MFP the device should do a little jerk (same with plugging the cable in). If cable then attempt to connect via all the COM ports that show up on MFP. If none of those COM ports result in movement and don’t change when you unplug the cable from your PC then my guess is the cable or the USB port (so maybe try putting the cable into a different USB port if you haven’t)…if still not then I do have the same concern as yourself with it being the board then.
Afraid I have no experience with wifi connection so can’t help if it’s that.
Does sound similar to this topic which I see that you’ve spotted and commented on. https://discuss.eroscripts.com/t/osr2-not-moving-when-running-scripts/159232?u=ratattack15