I'm not sure if this is indicative of anything, but I just noticed that when I manually move the X, Y, or Z axis, with the belts engaged, and the power completely off (no USB, no AC), the LCD lights up while the motors are in motion. I know that current is generated by motors like this (regenerative braking anyone?), but was surprised to see the display light up.
Is that normal? Does it offer any clues as to WTF is going on?
Thanks & Happy New Year!