Self-Assigned IP via router - no internet access - HELP!

Hi all,
I have 10.5.7 leopard installed on my C2D Macbook.
In the past, I never had any issues connecting to wireless routers with internet connection.
As of late, I am currently getting 'Self assigned IP address' which does not allow me to connect to the internet. It is connected to the router, but just no internet access. I can see the other Shared computers (Windows PC and mate's macbook pros) but just no web access. And they do not have a problem connecting to the internet.
I have attempted the following:
1) Turned on & off Airport.
2) Deleted network connections and re-created them, rebooted in safe & PRAM modes.
3) Deleted router Key chain permissions & changed permissions to 'access all'.
4) Deleted plist files from /Library/Preferences/SystemConfiguration/
5) Off Firewall & verified against the logs to ensure it is disabled.
6) Re-installed 10.5.7 combo updates.
7) Rebooted router, changed router channel, etc. Router is on the latest Netgear firmware.
8) Assigned IP address and entered the DNS, router values manually in Leopard.
9) Clicked on renew DHCP lease several thousands to no avail..
Occasionally, DHCP will work. But once I reboot & awake the mac the internet connection drops and 'Self Assigned IP' happens.
Does anyone else have any ideas? My only conclusion is that the bug is in Leopard 10.5.7.

Make sure your router has the latest firmware. If you are out of range of the WiFI or in a marginal area, this error simply indicates that your computer is not able to access an internet router/server and simply assigns the default IP address which is of the form 169.254.xxx.xxx. Basically it's a flag that lets you know you are not connected to a DHCP server.

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I called Netgear tech support and they had no answers, all they would do was make sure that the laptops were able to find the router, which they can, they just can't connect. Why are they creating their own IP addresses?
Is there a solution to this problem? What causes it?

Check your setup in the router for wireless clients. Log on to it and make sure that DHCP is enabled if you use it and you are in infrastructure mode ( wired/wireless combo ). Also, if the clients are B or G mode, make sure the router is set correctly to that mode or mixed. If the IP addresses are 169.254.xxx.xxx then they aren't really getting an address ( this may only happen in Windows, don't remember). If you don't use MAC address filtering for security, a blank list could have been turned on........ anyways, go through all your router configurations for wireless and make sure they are the same or close to the settings for the wired Mac that works. Probably just a checkmark somewhere that isn't supposed to be. Has anyone been in there messing with it? Good luck.
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I am having a vert weird problem. Airport base station hooked to a LAN router, new Mac Pro (10.5.1) hooked via cable to Airport base station. I get the self-assigned IP address and no internet. This happens also if I hook Mac Pro directly to router via cable. Oddly enough, during all of this, my iBook connects fine to the Internet, thru the base station using its Airport card. What gives, I may throw in the towel and go out and by an Airport card for my Mac Pro to get Internet connectivity, even though it sits only 6 inches from the base station. Also not, my Power Mac G4 was hooked via cable to the Airport and worked just fine...
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Funny you should mention that. This weekend I noticed that I can get an IP address and internet connection, either via the Ethernet cable from my AEBS or wirelessly from the AEBS on my laptop, but only one at a time and it depends which computer (iBook or Mac Pro) is on when the AEBS is toggled on/off. The only exception is my iPod touch, which can get an internet connection no matter which is the Internet connected machine(how's that for bizzare ?).
So, it appears the Linksys router that is hooked to our building's LAN is not distributing IP addresses (disconnecting the router and connecting the AEBS directly to the LAN produces the identical single IP address situation). Since using my Mac Pro with Leopard, I can only set up the AEBS in bridge mode, putting it in the DHCP mode causes the AEBS to be undetecable by the Mac Pro (haven't checked if the iBook sees it).
So I guess the questions are now:
- Shouldn't my router be assigning IP addresses from the LAN, isn't that it's job? Should I try buying a new one since I can't get AEBS to DHCP?
- Why would my iPod touch me immune from the single IP address situation?
- Any idea how to get Leopard to allow my AEBS to use DHCP?
Now I say I can't use DHCP, I mean that if I reset the AEBS, start from scratch and use assisted setup with Airport Admin Utility, and select DHCP at the place where you select Bridge or DHCP mode (or whatever the DHCP mode is called, I forget)the AEBS disappears. If I set bridge mode and then dicker around with DHCP manually, it doesn't disappear, but then it just won't give an IP address to any computer til re-rest and put back in old plain Bridge mode.
I would prefer to run the LAN right into AEBS and have it act as router and all that. I would also be fine with having a router and letting AEBS just bridge, just as long as I can connect to the Internet on more than one computer at a time.
I think I have a basic knowledge of what's going on, although my use of proper terminology is lacking, so feel free to follow up with any questions, I'd be happy to clarify.
This Leopard Mac Pro replaced a PowerMac G4 with Tiger and this all worked fine with it. When I traded computers and didn't get Internet I reset and re-setup the base station, so this might all be a Leopard problem
Of course, it brings me back to shouldn't the router hooked to my building's LAN be distributing IP addresses?
Thank you in advance for your help on this isssue.
Bob A.

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Try connecting to a Wi-Fi network with your Mac's AirPort.
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Hi--
Let me start off by saying I have absolutely no idea how this happened. I went to start my Macbook this morning and the Internet didn't work. Usually this is not big deal, and I just unplug the router and everything works fine. However, this time (for whatever reason) was different. When I go to my network settings, it says "Self-Assigned IP" under Airport and that "AirPort has a self-assigned IP address and may not be able to connect to the Internet." I was browsing other forums, and found that sometimes renewing the DHCP lease works. I did this, and still no Internet.
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http://www.linksysbycisco.com/UK/en/support/WRT320N/download
Message Edited by Matt Hall on 02-07-2010 07:13 PM

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Forgive the length of this, I've browsed past threads about this problem and googled everything I could, but I can't fix the issue.
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what's the difference between accounts?
My guess is that there is configuration setting, specific for the AirPort, that is conflicting with the Belkin router. When you created a new user profile, it used a default configuration that was allowed it to connect.
I would further venture to say that it may likely be a particular setting that got you access to the school's network that is causing the conflict.
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Self-Assigned IP via router - no internet access - HELP!

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