I am at page 165, steps 57-60, where it has me tuning the stepper motors by adjust the trim pots. When powered, the printer emits a high pitched noise from the motors. Entering the 'stest' command has no effect; nothing prints out in the console and there is no activity from the printer. When adjusting the trim pots, there is a pitch shift in the noise but still no movement. The x-axis motor is getting slightly warm, but the y-axis is not noticeably warmer. Are these single turn pots? The noise pattern suggests they would be, but there is no noticeable beginning or end on the pots other than the noise frequency going up/down, and they spin freely. We've adjusted them in both directions while entering 'stest' and all we've gotten is a repeating pattern of frequency shifts as they're turned and no movement or signs of attempted movement from the motors. I've also noticed that the x-axis motor wire harness seems to be flipped (from top plugged in it is black, green, blue, red), but from other posts I've read it seems like this isn't really a problem. I am running the windows (W7 32bit) version of ArC, and used XLoader to update the firmware to the newest version as of 2014-12-08 (0.15.1+20141116). I know the printer and ArC are communicating to some degree because the reset command is sent on startup and 'volt' returns the voltage. Thanks for any help Update - Discovered that running the calibration command got the motors turning, so I trimmed the voltage while it was doing that. It seems the stest command isn't working on my setup?