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Dust
bit late for a full reply, so this is quick...
check those endstops. Normal setup is if the switch is open or disconnected, it is treated as triggered and will stop movement in that direction.
re the vref, it only spins 360 degrees, so spinning it a number of revolutions doesnt help anything.. (most have stops so they only move about 270 degrees)
put it back to mid position for now (there should be a flat edge, make sure thats pointing away from the legs)
Put all 3 jumpers on the microstepping jumpers
Installing the endstops for the RAMPS board did not fix the problem sadly, and neither did installing the microstepping jumpers. I got a replacement setup figuring in the possibility that the electronics itself might be defective, but no dice, unless this is the second defective Sainsmart kit in a row...
Do I have to do anything special, beyond plugging the RAMPS into the Arduino, feeding the RAMPS power through the 5A power source (as 11A ordinarily goes to the hot end / heated base), plugging the Mega into the laptop via USB, to turn on the RAMPS / enable motion? Perhaps it is somewhere in this that my problem lies. The LCD screen works just fine, incidentally.