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Stepper motors buzzing but not turning with sangaboard v5.5

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Hi, I have built a microscope out of curiosity and out of the standard parts listed on the website.

I decided to buy he sangaboard v0.5.5 from the preferred supplier.

I cannot, however get the steppers to turn. The buzz and vibrate, but do not produce any motion. I have tried unmounting the X axis from the microscope and have even removed the cog, but no luck.

I have installed the sangaboard extension and tried the release and beta firmware.

I have also tried 3 usb-pd PSUs. And apple 61W, a belkin hub and a battery. All claim 5V3A support.

I am at a loss as to where to go next. Any assistance would be much appreciated.

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