I changed my ISP (and router) today, and now I can't get my Time Capsule to join an existing network via wi-fi. Until today, part of my setup consisted of my TC being used as my TM backup drive. It was located in a separate room to my Mac, and connected via my existing wi-fi network. Now, Airport Utility doesn't see the TC at all via wf-fi, and if I connect it via ethernet to the new router, the option to 'join an existing network' is not there, only extend or create network. Can anyone help here?