Airport connects to wireless network, can't get on internet

Hi All -
Having a weird problem. Set up new high speed wireless at home (ATT/Yahoo with a 2wire wireless router. Had NO problem setting up my MacPro (wired ethernet), MacBook (airport) and my wife's PC (I know, she's switching as soon as we can).. but for some reason my older Dual G4 with an Airport Card will NOT connect.
The Airport seems to connect to the Wireless network NO problem. I enter the WEP password and I am in as far as Airport is concerned. But it won't connect to the internet.
I tried like all the other machine to go into Network/Airport and set it up for DHCP just like all the other machines, however it gives a message in Network Status:
"Airport is connected to the Network 2WIRE900. Airport has a self-assigned IP address and may not be able to cnnnect to the internet"
When I go to show Airport, and choose "Using DHCP (like all the other comps) it has an IP that is not in the range of what is assigned by the router.. I never put that IP there, so I have no idea. I have tried to renew the lease, change to manual, then switch back to DHCP, etc. All to no avail.
It also does not show the Router IP address either..
I am really stuck and at a standstill as this Mac not only can't get online, but it has 3 500GB drives full of info I need to access from my other Macs.
Any Help would be much appreciated.
Thanks,
Steve

Hi Duane,
Thanks for the reply.
Yes, wireless mode is set to 802.11b/g
I did not enable a MAC list. I see that option on the router but am unsure of if I should enable it or how to do so.
It says:
Tip: To discover new devices to be added, disable the MAC Filtering feature for one minute, then refresh this page. Once new devices are listed, re-enable the MAC Filtering feature and modify the list below.
You can also add a MAC address manually.
As I stated, I setup my MacBook with no problems. It immediately recognized the network and turning on DHCP the router assigned it an IP without a problem.
Thanks,
Steve

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Hi Duane,
Thanks for the reply.
Yes, wireless mode is set to 802.11b/g
I did not enable a MAC list. I see that option on the router but am unsure of if I should enable it or how to do so.
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Airport connects to wireless network, can't get on internet

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