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I am so eating crow
OK. All you geeks. I'm sorry for claiming that Macs are easy.

We have two iMacs in the study. Also an Airport Extreme wireless router. The new iMac sees the router, delivers the internet, no problem. The old iMac can't see the wireless network. I've checked the seating of the airport card and antenna. All seems fine. The Mac says that Airport is working, but isn't connected to a wireless network. Trying to connect to the wireless network (with its regular password) fails.

OK, here's the freaky bit. If I use the Airport Setup Utility, the old iMac instantly spots the Airport Extreme, gives it its correct name, can interact with it and reboot it etc.

I have tried things like turning airport off and on, rebooting, and so on, and have checked all settings. Plugging in an ethernet cable gives Internet; it also gives a tripwire across the study floor.

Tips welcome.

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Is the Airport network configured to use 802.11g only, and not operate in 802.11b compatibility mode?

Do the various TiBooks use 802.11g? Because we've had no problem with them. Provided that's right, this does all sound quite plausible; it is Airport rather than Airport Extreme.

TiBooks are 802.11b. AlBooks are 802.11g. iBooks can be either depending on age. You don't have any TiBooks to test with, do you -- I thought it was one AlBook and one iBook.

Specifically, now I'm at home and can check on my Airport Extreme, what is the setting for Mode in the bottom left corner of the AirPort tab in the AirPort Admin utility? Might be worth trying a different channel, too.

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