Airport - denied permission to assign IP addres

Hi,
I have tried to share internet from iMac to my new macbook via Airport on that imac. I did all necesary steps and everything worked fine for like 2days. But unfortunately something happend , and I still dont know what , but its not working now.
I can access that macbook from imac (all files, folders, even screensharing) but I cant get internet there. The most important thing I find is this system.log messages (they appears in log everytime i try to access imac's wifi network)
Aug 3 17:58:11 Macintosh bootpd[2313]: DHCP DISCOVER [en1]: 0,31:30:2e:30:2e:32:2e:31
Aug 3 17:58:11 Macintosh bootpd[2313]: bootpsessiontransmit: bpf_write(en1) failed: Permission denied (13)
Aug 3 17:58:11 Macintosh bootpd[2313]: transmit failed, Permission denied
_So I guess the question is: Why is iMac refusing to assign IP addres to macbook ??_

some help, anyone ?

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i am currently using 10.6.8 snow leopard
i usually access internet through my broadband modem and wifi at home.
i've been using our home wifi network for almost 1 week now (since it's new) and almost everyone at home use it as well.
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showing me a message that
my airport has the self-assigned IP address 169.***.****.** and will not be able to connect to internet!

and now, when i tried to check again my network preference below the airport tab is showing a message that
"my airport does not have an IP address and cannot connect to the internet!"
then after seconds it will goes back to the first message that
"airport has the self assigned IP address etc....."
i don't know whats going on now!
airport tab is not showing green color anyway! i'ts always in yellow!
i tried turning it on and off but nothing happen! HEEELLLLPP!!!!

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Hi, I'd appreciate any insight at all on this...
Apologies in advance for this vast post...!
(but I guess I may as well mention everything I've already tried...)
BACKGROUND:
I was recently trying to add an Airport Express Base Station to an existing ethernet and wireless network, which has been working flawlessly for 3 years.
(Network consists of an ethernet-connected G4 Dual 1.42 desktop running OS X.3.3, and two wireless-connected iBooks- one a 12" running OS X.3.5, the other a 14" on OS X.4.2).
For various reasons, I've now given up with the Airport Express, but ...
PROBLEM:
On the wireless 12" iBook- "Safari can't open the page "xxx" because it can't find the server "xxx"- ie, the internet connection is now wonky.(The problem is the same in Firefox, IE, and Camino too).
The fault must be with configuration on this laptop, as the other two machines on this network are still running and connecting normally with no problems at all.
What is the cause of this problem? (IP addresses? DNS server?)
WHAT I'VE TRIED SO FAR:
1. First looked at System Preferences --> Network --> Network Status, where I see this;
"Airport is connected to the network "Fritz!Box SL WLAN". Airport has a self-assigned IP address and may not be able to connect to the Internet."
Alongside it an amber button (which is usually green).
Then according to JohnHuber1's suggestion in Discussions on May 3rd 2006;
"Go to System Preferences --> Network and double click on Airport to open its preferences. Click on theTCP/IP tab and select Configure IvP4: "Using DHCP" and click on Apply Changes to save it."
I tried toggling this (it was already set this way), and then Restarted, but it hasn't helped.
I also tried clicking the 'Renew DHCP lease' button. Also hasn't helped.
2. Repaired permissions. It hasn't helped.
3. Read Apple KB article No:106798- 'Troubleshooting "Server could not be found" messages'.
From this article, it seems that
a) The problem cannot be caused by "an actual loss of internet connection", as the other 2 machines are still connecting fine.
b) Typing http://17.254.0.91 instead of http://www.apple.com makes no difference, therefore it doesn't APPEAR to be a DNS server problem. (?)
4. Tried to reconfigure the Airport settings using Network SetUp Assistant.
This allows me to select Airport as my connection method, select the network from the list; but once I've entered the network password and pressed 'continue', it then gives me a dialogue box, saying
"Unable to establish a network connection. Your computer could not connect to the internet. Click OK to go back and change your network settings and try again".
Returning to Network Prefs, I now see a box saying "Your Network Settings have been changed by another application".
I can't seem to get out of that vicious circle.
5. Opened a fresh Test Account, behaviour is the same here as in the regular user account.
6. Opened Network Utility, tried to 'Ping' on 17.254.0.91 (Apple site). Then tried to Ping my network router (192.168.178.1), and then also the other 2 computers on the network. Result in each case was "10 packets transmitted, 0 packets received, 100% packet loss".
What can I do to fix this problem? I suspect it's some small configuration checkbox in Network preferences which I've inadvertently altered.
But have I got any idea what I've done...?
Sorry for the epic post. But you get the idea...!
Thanks for your thoughts...
G4 Dual 1.42, FW800, 2GB RAM, (OSX.3.3), iBook G4 (1.2ghz, 1GB RAM, OSX.3.5) Mac OS X (10.3.3) 3 int.HDs, 3 Lacie ext.HDs, Logic Pro 6.4, RME Fireface 800.

Hi Grant, thanks for jumping in...
Have you removed the troublesome Airport Express?
Certainly have, that was Step 1 several days ago!
Are you using encryption?
Yes, I have to enter a password every time I've tried to use Network Set Up Assistant. I'm pretty sure I've got it right- it won't accept anything else.
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Not as far as I'm aware. Could I have done it inadvertently?
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Guess it must be... it worked fine before, and is still ok with the other 14" iBook.
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"AirPort is connected to the network... AirPort has a self-assigned IP address and may not be able to connect to the internet."
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I have got exactly the same message after we re-configured our router. I was connecting using my iMac wirelessly before hand, but now cannot. Our other PCs can connect wirelessly to the router so it's not the router. I have also tried the firewall solution but that doesn't work either.
I did call Apple Support who said that a full troubleshoot would cost £35 as my computer is older than 90 days (well yes it's been working fine that's why it's over 90 days old, it's only now that it isn't!). He said a trouble shoot didn't guarantee success so I declined his offer to charge me an extortionate amount of money for nothing! He did say that the router needs to be giving the Airport an IP address, but it isn't doing it now. His only suggestion was to turn off the router and turn it back on or power down the iMac. Neither of which help.
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Airport - denied permission to assign IP addres

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