Self Assigned IP Address, wher the heck did that come from?????

Getting flipping well annoyed with this 10.4 software release! Come on Apple say something find the fix. The problem started with 10.4.4 EVERYTHING was working fine prior to installing, Wifes imac on airport, me on my G5 chatting happily away, the reason I purchased the .mac accounts and the iSights. After 10.4.4 came the problem of the iMac getting an IP address of 10.0.1.x from the airport and no longer able to connect to the internet. So I powered off the airport and connected the ethernet from the Zoom ADSL router direct, and the iMac claims there is a "self assigned IP address" on the Ethernet, which is not true, the machine uses DHCP, rebooted so many times (Windows funnily enough never needed as many reboots as OSX Tiger! and now seems like a better choice if truth be told) and everytime this self assigned IP address appears. Now if I connect my PB to the same cable I get 10.0.0.x and no problem with the internet connection. Settings are IDENTICAL, I even cloned my PB and booted the iMac from the clone and STILL we get "Self Assigned IP Address" on the iMac!
Does anyone have any idea how to stop the self assigned ip address problem?
Jed "Really not very happy at all" Stone

Powered off the Zoom DSL modem for an hour or so, and
now it all works fine, got this Gem of info from ther
Macosxhints website, a mighty fine site it is as
well. Regards Kev
Does not solve the problem for me. I'm sitting in a motel with a wireless net. I can connect to the Red Carpet network, with a strong signal, but Safari says I'm not connected to the internet. Network status gives me the same dumb "self-assigned" error. TCP/IP is set for DHCP. Since it's not my base station, I can't just go and recycle it. It did work once, but I haven't been able to reconnect. I've tweaked the connection multiple ways, rebooted multiple times, etc. etc. etc.
So what gives, and what can I do.
Powerbook G4, Mac OS X 10.4.6
Machine Name: PowerBook G4 12"
Machine Model: PowerBook6,8
CPU Type: PowerPC G4 (1.2)
Number Of CPUs: 1
CPU Speed: 1.5 GHz

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The documentation says this equipment will work with Snow Leopard. Is the documentation wrong? Should I try to find a simpler wireless router that doesn't demand as much from the computer?
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I am pretty sure the Express is running in the wrong mode..
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The IP address is always different, but it always gives me a subnet mask of 255.255.0.0 and no Router IP.
This problem only seems to occur when both Macs are connecting and not connecting to the Time Capsule wifi. That is, when my girlfriend is out of town with her MBP gone, I never seem to have the issue.
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I've tried just renewing the IP. I've tried restoring the factory settings on the Time Capsule.
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I have a sneaking suspicion this may have something to do with the problem: My MBP is a 3rd generation copy of the data from hers. Hers was once my MBP, but we copied everything from it to a new MBP, which later was copied to a third MBP (the one I'm using now).
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AirPort has the self-assigned IP address .... and will not be able to connect to the Internet., AirPort has the self-assigned IP address ...and will not be able to connect to the Internet.

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Hi, the one below worked for my case.
I beleive there are different reasons for this problem. In my case, doing try and error, I found a solution for my case (at the ver end of this post). The reason I say this is because I had the same problem and googled the problem for quite a while ... none of the suggested solutions worked for me, although it seems like they worked for others in some cases. I tired taking my computer to different wifi networks (mainly unprotected ... ie no WAP) and alwasy got the same problem. I even took the computer to apple and no luck ... surprisely when I took it to apple it did connect to apple's wifi network in the store, so according to them it was probably some problem with my network ... when I walked out of the store I tried connecting to another open network in the mall and got the same problem ... went back to apple and they tried a few things without any luck (however it would connect to apple's network)
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