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Owing to my earlier massive shorting/melting issue, I had to replace both the power header and connector. After replacing wires, recrimping and hooking everything back up, temps are good, no signs of shorting anywhere, but zero power to the hot-end or motors.

The fuses are fine (brand new and checked twice for continuity).
Power at the connectors is 12V+ for all 3.

heat bed works fine, and when heating is on, I can measure the voltage at the heat-bed mosfet.

But, when I turn on hot-end, or give a command to move the motors, the command behaves as if it executes, but nothing happens.

And, when the hot-end is on, no power at the hot-end mosfet.

I would suspect the fuses, but as I said, they are fine. I'm at a loss here.

thanks,

-sandy

What firmware and version are you using?

That happened to me a few times where I UNINSTALLED and reinstalled both aduinno and Repetier and everything was working right. And some time I had to redo both the hot end and fan wires at the Rambo as that screw connection isn't the best way to go. Maybe because early on I was in there with my big
hands and accidently pulled a wire loose. Rambo should have a better way of connecting on for the hotend and fans.

Jmick in NV

Is it all four motors, or does your extruder retract?

The next easiest thing to try is changing the hotend connections to the other hotend output, or maybe changing one of the motor connections to the fourth plug would be easier (easier physically, there's more in firmware to change for that though..) Either way, don't forget to update the firmware with that change, then test to see if it works.