Esc calibration not Working

I have a Pixhawk 2.4.8. I tried to calibrate using it but the ESC never goes into calibration mode(no beeps). I followed the correct procedure of connecting the Power, waiting for 3 color lights then disconnecting and connecting again, but they never calibrate. Then, I tried to calibrate them separately using the Radio controller and I was able to calibrate them but now whenever I turn on the pixhawk motors never move after arming. They just keep beeping. What should I do?