Thanks for the replies. Will check out the Apple Forums when I have a bit more time. What is strange is that I previously posted the question of whether you can disconnect the ATV and reconnect and was told by a couple of 'Goners that they hadn't had a problem, which I am sure is the case. So when I reconnected and it wasn't recognized I was very surprised. Apple TV 1 worked fine before I disconnected/reconnected, so I doubt it's a firewall problem, because I never had to fiddle with firewall connections either when I first installed ATV No. 1 or No. 2. To answer Dgaylin's question, both are on the same wireless network and No. 1 was sort of recognized but not fully.
Thanks again. I am always impressed by the generosity of this community in trying to help out. Regards to you both.
Thanks again. I am always impressed by the generosity of this community in trying to help out. Regards to you both.