Hi, I bought a 2TB Time Machine that I want to add to an existing airport network consisting of an Airport Extreme (connected via Ethernet and cable modem to Comcast) and an Airport Express. Like many others whose messages I've read, TM and the network don't communicate. I've tried: --Using the Airport assistant to set up the TM both automatically and manually. --Reset the TM to factory settings several times. --Swapped the TM for my Airport Extreme by connecting the TM to the modem via Ethernet and moving the Extreme to another location Nothing works. What happens is that, after powering up the TM at factory settings, it eventually shows up (yellow light) as the third device in my network. When I try to configure it (either automatically or manually), I'm told that I have to leave my network to do so. I leave the network, the TM is alone on the network, I go through the set up, and the TM begins to restart. Then either I get a message telling me than an error occurred or Airport Assistant tells me that it couldn't locate the TM after it restarts. I've tried everything I can think of repeatedly, just in case. Suggestions?