Goodonya Perry. It does my head in every now and then. Right now the nema 17 has failed to proceed even though I am using the same sketch and same wiring as yesterday when it worked. So now I am trying to find a diagram and a sketch for a nema 17, a cnc shield and an A4988 to prove that things do work or is the motor stuffed. With everything the same as yesterday, I think, the motor just locks up when I turn the power on. Any suggestions.