Firmware For Prusa I3 (1 reply)

Hi, I have a problem with my motors. All the X, Y , and Z motors can only move in one direction. I read about a post here and I typed in the M119 command. When the end-stops are pressed, the show Low, released and they show High. And sometimes, lets say I command it to move Left on the X-Axis in Pronterface, it can only move 0.1 step, and when I tried clicking 1 step, it stops. After that stop, I can't get it to move in any amount of direction along the axis unless I restart the printer. Tried repairing the solders, and tuning the pots, but no luck.

I suspect its a firmware problem? Which line of the firmware should I change? I tried Marlin and Sprinter, but they both show me same results.
Or better, is there a firmware typically for a Prusa I3?

I am using RAMPS 1.4,