We check that all the drivers are functional as part of the board test at the factory. It would be rare but entirely possible that a driver has gone bad, and I’ll be happy to replace the board if this is the case.
But first, let’s run some tests and figure a few things out:
First, I always ask for pictures of the board, machine, and wiring so that I can peruse and attempt to spot any glaring issues.
Can you plug the Y motor into the Z port and try to jog? The Y motor is a known entity with regard to steps and motor current requirements. Please let us know what happens there. A video could be useful so that I can see exactly what the issue is. "
There are multiple kinds of motor buzzing and by now I’m fairly well tuned to them
Next, you may need to adjust the config on the board’s memory card. Z is Gamma and there is the current which can be set up to 1.2 and the steps per mm would have to correspond to your setup.
Finally, you can try to jog by issuing a gCode command such as
G0 Z10 F120 where F is a low value in the range of 60-300, as these would correspond to 1-5mm/s. Perhaps work your way up a little more from there. 600 is 10mm/s which would be a noticeable speed even for the laser head.