Airport status at 3 bars but can't connect to internet

My 17" Powerbook is the only one of five Macs in the building that isn't able to connect to the internet with our Airport Extreme base station. The airport status icon shows 3 "bars" but will not connect. When we put the Powerbook within 15 - 20 feet of the base station, it works fine, but this is not practical.
If it matters, the other computers are a G4 MDD, an eMac, a 14"iBook and a G4 iMac "flower", all using a mix of older Airport cards and new Extreme cards. I have checked the Interference Robustness setting and it doesn't have any effect.

"When we put the Powerbook within 15 - 20 feet of the base station, it works fine"
So if I have this correct, when the powerbook is close it behaves normally, when it is moved away it still sees 3 bars, but will not connect. but other compouters have no problem.
it sounded like interference at first, but other computers ought to be similar on that point.
Can you see the other computers on the network when you can't get to the internet?
can you see the base station? (airport admin utility)
any other networks in the area?
handheld phones / microwaves nearby etc?
airport card seated properly in the powerbook?
If you restart does the connection return temporarily?
any encryption running? if so, turn it off and see if the connection returns after restart.

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In System Preferences > Network > Airport/Wireless ...
... make certain Airport/Wireless is at the Top of the list. If not, there is a command accessible with the gear Icon under the box to re-order the list and put it there.
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Were you able to copy the DNS addresses to the MacBook? Were you able to delete the incorrect ones? Did you restart the MacBook before trying to access the Internet again?
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A computer to computer network can only be used for sharing files.
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nickpiri wrote:
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Hello,
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Hello mookyee. Welcome to the Apple Discussions!
It's always a good idea to power recycle all of your network components when changing configurations ...
Try the following, in order, checking for Internet access after each step, until resolved:
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o Power-on the AEBSn; Wait at least 5 minutes.
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4. Contact your ISP to have them perform a "modem reset."

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