My PowerBook G4 is connected by Airport To Internet/ My iMac Not?

Both my Powerbook G4 & iMac G4, were connected to internet through an airport dual ethernet. . .until today. My iMac does not see any network from my Airport - My Powerbook G4 does see the network, without any problem. I don't understan what happen. I tried all the suggestions ( unplug - plug etc) without any help. I shutdown my iMacG4 unpluged my cable modem - unpluged my airport & than pluged both my modem & airport and restarted the computer.The Network Staus message I get, "Airport is turned on but is not connected to a network." There's no network to select since none are displayed.
Now, my Powerbook G4 doesn't have this problem! Under Internet Connect I have list to select from!
Up till a few days ago, both the iMac & Powerbook were connect by Airport to Internet...?
alowheo

Eulogio,
i went through a similar thing in the past weeks: my iMac had suddenly problems connecting to my network, whereas the PB connected OK. at the end things turned out to behave in a logical way: if the PB and the Airport-express base station talk to each other, and the PB can configure the base station, whereas the iMac has problems (once making contact and loosing it very fast, the next time not be able to connect, saying: "there was an error in connecting...", and so on) - this means (and has been verified by the service guys) that the iMac is the cause, not the base station.
This can be hardware or software. I was working hard before i could narrow it down to hardware. (I suspected a setting-file whcih didn't get updated)
In your case things look obvious to me (well, after i went through my last three weeks...): the PB sees your net and all the other nets, the iMac doesn't. If you can configure the network with the PB, then the base station and the PB are fine, and the problem is in the iMac.
I suspect, that you have in the iMac "Airport on" - which means you have this 4 concentrical ring-sections of 90 degrees in your menu-bar. Or is it empty? if it's an empty symbol, then the airport card has no power. If you are sure that there is power on the iMac airport card, and you don't see any network, that means that there is no signal. this can be :the card itself, the antenna, or the logic board ...
A simple problem might be that the antenna is not well connected. Open up the iMac and reseat the antenna . Be careful to follow the instructions for opening; don't touch the electronics before discharging all static electricity of your body by touching the heavy metal frame which holds the electronics boards!! Try to reseat the antenna, in the iMac G5 (probably the same as in yours) you must feel a serious "click", when it is way in the connector.
If it is the card or the logic board, then i'm afraid that only the service people can help you. It can be tricky also for the service people to tell which part it is...
your remark :"Let me add, that once after the unplug/plug cable..." reflects EXACTLY the behaviour of my iMac.
Everything together: it looks to me as hardware, and except the antenna being badly seated, I'm afraid you have to check with the apple guys.
PLease, report back - and good luck.
Thomas

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