Hi fellows!
I was printing in a graber in PETG in 240º / 90º, but I had not installed an external mosfet.
Because of this, my ramps burned one of their pins, user to receive the 12V from the PS to the hot bed.
Then, I decided to change my ramps shield, and remade all the wiring.
After this, the motors stopped to move.
I have already checked the reference tension (Vref) at the drivers, and they are all ok.
Does anyone have any hint?
Thanks.

... check all the needed signals to the drivers (GND, Vmotor, VCC, Signals, ...) for continuity and sound levels.

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Viktor
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