Cannot Extrude

All,
I purchased a GEEETech Prusa i3 thirdhand off CL about 2 months ago. It has the GT2560 board, dual Z axes, single X, Y, and extruder. The heat bed has not worked, but I just set it to 10 deg C and ignore it as I print PLA. I have printed about 6 or so parts and then all of a sudden, I went to print and the extruder motor will not move.

I made sure the hotend temp was above 170. I would home the cartesians and then try to jog the extruder, but no help. I made sure the reading on the POT on the E0 was between 0.8 and 1.2 and it was fine. I even switched out a cartesian axis for the extruder and the extruder will work, while the E0 axis will not move. I decided that it might be the board, so I ordered a Mega 2560 and RAMPS 1.4 and installed it and it has the same exact problem. Can I post the config file or the some other part of the marlin firmware on here to have someone take a look at?

I am baffled by this.
Thanks in advance,
Curtis

Also,
I put in the latest Marlin, and am using Repetier Host as my control software.
C

Disregard,
Found to be a bad stepper driver.