extruder working but not XYZ (1 reply)

Hello. I recently completed putting together a prusa i3 with RAMPS 1.4. I loaded it with the reprap test code found at (http://reprap.org/wiki/File:RAMPS1.4_TestCode.pde) everything works fine and all the motors move back and forth some. When I load it with Marlin firmware I am only able to make the extruder motor move. XYZ do not move and simply make noise. I am using Pronterface to run test commands. Any help would be appreciated and please assume I am stupid. Thank you