what stepper driver do you have there ?
it looks like a DRV 8825 (just the purple pcb)
If it is a DRV 8825, it looks to be in backwards.. should look like ramps with drv8825
If its not (as your picture is not clear)
Check voltage on vmot pin make sure you getting 12v to that pin. (pins image) (vmot is same pin on all pololu modules)
Also verify endstops are really disabled... send a m119 to get their status
it looks like a DRV 8825 (just the purple pcb)
If it is a DRV 8825, it looks to be in backwards.. should look like ramps with drv8825
If its not (as your picture is not clear)
Check voltage on vmot pin make sure you getting 12v to that pin. (pins image) (vmot is same pin on all pololu modules)
Also verify endstops are really disabled... send a m119 to get their status