Can't connect - self assigned IP

I'm not very computer savvy, I have G4 powerbook and airport express. Blueyonder broadband (wire from wall into box, cable from box to computer) I have never managed to get it working wirelessly as I spend all day trying then get frustrated and give up.
Any ideas why it keeps having a self assigned IP address??

I have the same problem, but a slightly different setup. I have an iBook G4 with Airport Extreme, a PowerMac G4 with an 802.11g PCI card, a clamshell iBook G3 with an Airport card (802.11b), and a Netgear MR814 802.11b router (SSID Silverbox). The PowerMac G4 and iBook G3 work flawlessly with the router. The iBook, after long sleeps, gets the dreaded message:
"Airport is connected to the network Silverbox. Airport has a self-assigned IP address and may not be able to connect to the Internet."
I cannot get to the Internet, nor to the router. It says I am connected to the router, but cannot bring up it's admin panel (yet I can on the wireless PowerMac or clamshell iBook.)
I've read tons of suggestion on what to do, but nothing works. It seems to have appeared since maybe a Airport update(?) The problem is fixed if I restart the router, but that is truely a hassle, and disrupts the connection of other computers. To make matters further confusing, I can connect to other access points around my neighborhood, and obtain an IP perfectly, but when I try mine, I get the "self-assigned." It would appear that the router (and it's DHCP feature) is not providing IP addresses, but it is to my other two computers. It's almost like the Airport Extreme card, and the Netgear 802.11b router don't want to play well with each other. I've had this iBook since June 2005, and the problem has only popped up in the past 2 months. The only thing which has changed (that I know) is that the base station was moved to a new house, with many access points available. I am sure the channel is different from all the other access points, but could that be conflicting somehow? And if so, why is it not affecting my clamshell iBook G3 or PowerMac G4?
I am at my whits end. Apple support will not provide help, and I cannot replicate the problem at the Apple Store. So, is the problem my router or my Airport Extreme card? If the router work with my other computers, then that can't be the culprit, however if my iBook G4 will connect to other wireless networks, then it can't be the Extreme card.
HELP!!!

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