New macbook does not "see" my network, old macbook pro and iphones do...

Yesterday I installed an upgrade to my airport extreme base station, now my macbook pro and the 2 iphones in the household see the wifi network but the other macbook does not. It does see the neighbors wifi networks and will see it when I connect via a cable to the base station by no wireless connection... help!

I am having a similar problem. I have 19 iBooks in a classroom and, suddenly, none of them can see the AirPort Express network when they log on. Instead, the iBooks try to connect to a Windows-based school network. I have designated the AEBS network as the only preferred network but the iBooks NEVER try to connect to it first. However, if you click on the AirPort icon in the menu bar, the AEBS network is clearly visible and clicking on it immediately connects you to the AEBS network.
When I originally set up the network in January, everything worked just fine. After the upgrade to AE Firmware 5.7 and various OS X 10.4.5 updates, everything has gone downhill. I had the dropped signal problem that so many have reported. I downgraded to AE Firmware 5.5.1 and followed J. Exby's procedure to upgrade the AEBS framework. That solved the dropped signal problem. But now my iBooks cannot find the AEBS network when they log in.
I have set the AirPort Network Preferences to connect Automatically or to Preferred Networks with the same result. I have also set the option to "Keep looking for recent networks" and it never finds our AEBS network. Yet, the network can be accessed manually through the AirPort icon.
BTW, I use one of the iBooks myself and it works perfectly and finds my preferred network in 2 other locations with non-AEBS networks. But it cannot see its own preferred network in school.
This is really bugging my students--and me! Any suggestions? THANKS!

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