Old original R1+. This is strange so hang with me. My extruder stopped. So I searched and found troubleshooting tips. Swapped the connection to the X motor on the arduino board. The motor turned! Easy fix. (I have a spare identical arduino) so I swapped the amplifier. Nope it didn't work. So I swapped the whole arduino. Still not working. So I think maybe the LCD controller is not sending the signal. I disconnect the LCD controller and hook up my laptop. Nothing! Any ideas?