Stepper motors are not working when connected to RAMPS board in the X,Y,Z pins.
I used A4988 drivers and the Arduino board is an original version. I checked the input voltage to the RAMPS board, it's 12 V. The bed and the stepper motors are working fine. I tried replacing the driver, checking with another RAMPS board, replacing the SMPS nothing has worked. I checked the input voltage of the arduino both the 5 V and 3.3 V pins are working fine.