Hey guys, I just got my RepRapGuru kit yesterday, and I assembled it with relatively few problems, but my Z axis will only step in one direction. I've switched between the older Marlin RepRap firmware, and the newest Marlin Bugfix build, and I think it may be a problem with either the end-stop, the RAMPS, or the Arduino, but as far as that, I'm pretty much out of ideas. Also, I can't get my LCD dby Lightfeather10 - Prusa i3 and variants