I have tried searching through the Mac forums and Support online. I haven't as yet posted a direct question to them.
I bought the AirPort base station (square one) in the states last summer. It worked brilliantly, just as advertised.
In December I bought a stand alone upgrade of OS X "Leopard" for the 24" iMac (previously on Tiger) and I had also bought a brand new Macbook 13" with Leopard pre-installed.
Both units Airport Extreme cards work well. I have tested the iMac with another non secure WiFi signal and it's fine. The Macbook picks up the various WiFi's in the hotels with no problems either.
Even my old iBook 12" (running Panther) was picking up a nice signal from the Base station.
However, foolishly and against all instincts, we turned off the modems and the base station when we went away to the states in Jan.
Upon restart, the base station works fine however, the WiFi is impossible to connect to. Even with the WPA and WEP turned off. I know it's not the iMac, Macbook nor iBook's WiFi card as they can pick up all the other signals and join the open networks. (The signal strength is fine, they just cannot connect)
I have done a firmware update.
I have done a soft reboot and reconfigure.
I have also done a full system reset and reboot. (and configure...)
Nothing has worked.
I have tried reviewing the support section of Apple but haven't seen any thing that works.
Error message on the iMac and Macbook.
"Connection timeout"
or
"Failed"
Error message on the iBook,
"There was an error joining the AirPort network "wild chook""
Hardware info.
AirPort Base station. (approx 9 months old)
(0x14E4, 0x87)
IP 10.0.1.1
Version 7.2.1
AP ID 00:1B:63:2B:96
5
I use Virgin for the DSL modem connection, always on sort of thing.
Configure IPv4: suing DHCP
IP Address: (Provided automatically)
From Macstumbler 0.76
SSID "wild chook"
Channel 6
Signal 78
Noise 0
WEP no (back to WPA now)
Vendor unknown
MAC 1B:63:2B:96
5