There are a few reasons why your LAN cable might not be working on your PlayStation 4. One reason could be that the cable is not properly connected. If you have an Ethernet connection, make sure that it is working properly by checking to see if there is any noise or interference coming from the network. If there is, you may need to replace the Ethernet cable. Another reason could be that the PlayStation 4 has a built-in modem and router, and the LAN cable does not go through these devices. You may need to purchase a separate LAN cable for your PlayStation 4.
