Hey all of you.
I have this problem that suddenly the Extruder made a very loud noise then stopped working.
I have taken the cable to the Exstruder and connected it to the Z and the extruder stepper works fine.So no faulty stepper motor. 
I have tried to change the stepper driver (The small baords on the main board.) from the Z to Exstruder, and the problem is the same, the Extruder does still not work. So Stepper driver OK.
I have seen that the little red LED on the main board on the right side of the stepper driver does not light up when given a command.
Does this mean that I have to buy a new Main board ???
Or is there anything else that I can try out.
Thx for any help in advanced.
Regards Russell