Long story short, myself and a neighbor share an internet connection. I have two Airport Extremes connected to her router via Ethernet like so. TalkTalk Router ----> Downstairs Airport ----> Upstairs Airport. Last week, TalkTalk's service went down for a few days. But now the issue has been resolved (the TalkTalk router is connected to the internet just fine), I cannot get my Airports to play ball. They both think that the Ethernet is unplugged, when it isn't. I've tried resetting all routers to default settings several times, no success. I've even tried connecting them wirelessly to a business connection we have in the house, it was successful, but again the Ethernet refused to play ball. Any ideas what I can do?