I am trying to build a laser engraver with the arduino nano, the cnc shield V4, and the A4988 drivers and i have reached a point where i have everything and i am testing out the stepper motors. The motors are nema17, and i have watched EVERY youtube video and i have read every forum post related to this topic, but still, my motors are not working and are only making a humming noise and stop. I adjusted the pot on the driver board to 0.952V, i have uploaded the grbl firmware on the arduino nano, i have connected with laserGRBL and it all works fine, but when i try to move with the arrows from the laserGRBL software the motors are just screaming and then stop... i do not know what to check, and what to test anymore, i tried removing the jumpers, tried every combination of micro stepping, i am out of ideas...please help me.