Did you try the 'simple stepper' programm @groundFungus recommended in post #3?
If this does not run either, the problem is the HW, if it works, the problem is within your sketch which you still don't show.
Did you try the 'simple stepper' programm @groundFungus recommended in post #3?
If this does not run either, the problem is the HW, if it works, the problem is within your sketch which you still don't show.