i need of help

[avggrech]

i have a big problem with my printer i cant get it to print. the printer works and moves all the axis but the extruder motor just doesn't want move . i have connected the motor to other axis and it works. ive also switched over the driers with other axis and they work just the extruder does not to work i highly suspect that i have a problem with the Firmware i tried using Marlin but haven't managed to get it working at all. i have used reprap and that makes everything work apart from the actual extruder. Please help !! attached you can find the current firmware i am using.
it is a pursa i3 stile printer using a ramps 1.4 board with a reprap lcd . it doent really matter what firmware there is as long as it works. if any one could help me i would much appreciate it