Prusa i2 axis not moving

Hi Guys!
I am facing one issue with my Prusa i2 the things is while working my Ramps extruder heater was not heating up so I changed the Ramps 1.4 and now when am connecting it to my printer axis are not moving I did the connection double checked everything even changed and tested with other ramps but the problem is still there is no movement it's giving little jerk and stop moving. if anyone knows what to do please update !!

What firmware do you have? What commands are you issuing? How successful are you at communicating with the board via host software? How much voltage is going to both RAMPS terminals? Make sure your power supply is good either with a multi-meter, or, lacking that, by testing on another machine.