Hello yall. I have a new iMac which is connected to to the internet via an Airport Extreme base station, via the gigabit ethernet port. It is working perfectly. I just bought an Airport Express, so I can connect another computer in the next room to my network, via the ethernet input. When I open up Airport Utility, my base station shows up as available, but my express does not. It is plugged in and has the flashing amber light. What am I doing wrong here?