When I connect my ps4 to my tv, it reads, connect this device using a USB cable or register it again. even though I used a USB cable to connect my controller to ps4, it doesn't work instead the same information "connect this device using a USB cable, or register it again" keeps appearing. Can someone direct me how to fix this problem.
From personal experience .. In the process of re-initialising my PS4 I tried re-linking the controller. I had exactly the same problem as the OP. I was using the usb cable originally supplied with the console. Using another usb cable (not a charger only cable which may lack the necessary connections) worked so I can only assume the original cable was faulty.