Customized Ultimaker 1: Extruder motor does not move
Did you heat the hotend before attempting to move the extruder?  Most firmwares block cold extrusion.  If you send the printer M302 it will allow the extruder motor to move without the hotend being above the temperature set in the firmware.  Jumpers next to drivers are used to set microstepping, no need to adjust these unless you changed to a different type of driver or want to use different microstepping.  Changing them usually requires changing the steps in firmware as well.  Also, swapping drivers or motors while the driver is powered can destroy it.