If you are experiencing issues with your wn531p3 ac1200 setup, there could be several reasons for this problem. First, ensure that all cables are properly connected and that the router is receiving power. If the issue persists, try resetting the router to its default settings by pressing and holding the reset button for 10-15 seconds. Once the router has been reset, try accessing the setup page again by entering the default IP address (usually 192.168.10.1) into your web browser's address bar.