New iMac will connect to Airport but not Internet

I've just bought an Intel iMac 2.94ghz, brought it home and tried to get it onto the internet.
It sees my wireless network and connects just fine, with all bars full. But if I try to view a page in Safari, I get the 'You are not connect to the Inernet' page. I've tried restarting, turning wireless on and off, restarting my router, restarting, reseting and updating the firmware on my Airport Extreme, dumping AppleAirport kexts, disabling IPv6, renewing the DHCP lease (always comes back self-assigned) etc etc but nothing helps.
Additional info:
* my iPhone, MacBookPro and girlfriend's Windows laptop all still connect to the internet fine
* my iMac can see and connect to the other computers on the network, and vice versa
* my iMac cannot connect to my router, unless I manually assign my iMac an IP address
* if I manually assign my iMac an IP address, I can see my router, but am still 'not connected to the internet'
Has anyone got any ideas what could be wrong here, or should I be taking my iMac back to the Apple store?

Bought my iMac in February and worked fine up until about a month ago. I have assigned a manual IP address outside the range of other devices in my network (e.g. 192.168.0.10) and this seems to do the trick (most of the time). The problem I had was the self assigned IP address wasn't in the usual range for my router so while I was connected to Airport and the internet I couldn't view any webpages. Had to do the same thing to my Macbook which I purchased about a month ago.
The strange and very frustrating thing is sometimes it doesn't recognise my preferred network but then when it asks me to join a network, my network appears! When I try to connect and confirm password, connection times out. Whats that all about?
The bottom line is the assigned IP solution doesn't always work but it seems a combination of issues rather than one. None of the other devices on my network (ReadyNas Duo, Xbox 360, PS3, Wii etc) have issue connecting to the router using DHCP but for some reason Airport has trouble dealing with this and assigning a correct IP or can't find the network all together.
Only thing I can think is its some Airport update that has caused these intermittent issues and realy hope they fix it soon.
So no update but just wanted to share my experiences in what seems a very wide scale issue...

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My MacBook air started out working beautifully on my wireless network-high download speeds, solid connection, etc... After about six hours of operation however, it has stopped being able to find the internet consistently, no matter what wireless network I try. I use a NetGear wireless hub in my room, and my laptop is able to consistently find and connect to the network (the hub is only about 3 feet away) but it cannot connect to the internet. Under network settings I get the message "Airport has a self-assigned IP address and may not be able to connect to the internet" or "Airport cannot connect to the internet." I know that the internet is working, because the network works fine for my MB Pro, iPhone, TiVo, and xBox 360. In fact, the MBA is occassionally able to find the internet and get an IP address. Sometimes this IP address allows me to load web pages extremely slow and sometimes I cannot even find google. The problem extends beyond my one network, however, as I have difficulty connecting to other wireless networks. I am on a college campus and sometimes can connect to the campus WiFi, but it again frequently connects without being able to figure out an IP address. Some help would be great.

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I hope Apple is looking into this wireless issues.
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Hello Bmowat,
Thank you for using Apple Support Communities!
It sounds like you are able to successfully connect to your Wifi network, but cannot get internet access.
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i m a bit confused here as to why the ISP techs asked you to forward ports on the router...port forwarding is needed for a specific application or a device that is behind the router....
the mentioned ports are for AOL messenger ( AIM )....and has nothing to do with the modem...anyways , let us work out together on this issue...carry out the steps i mention and you can revert back with the results and your success rate...
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6)if the ip address comes up as 192.168.1.x , change the local ip add of the router to 192.168.2.1 and do a power cycle..
let me know for any help !!!

New iMac will connect to Airport but not Internet

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