Some advice for PPM encoder and buzzer PLEASE HELP

I’m having trouble arming the pixhawk after I changed my joystick setting which shouldn’t effect the drone whatsoever( cos I checked the monitor all channels works fine). then I tried it again and i couldn’t arm the drone. Hence I changed the powering wire from the PPM encoder to Rx from port 1(which is incorrect) to some other port. Then I tried again and heard beeping noise comes from the buzzer. Need help… Thanks!