Lost connection to internet through airport

My Mac at home is configured to a timecapsule and connected through airport wifi. The Time capsule is connected via cable to modem and out via cable to Internet. Up until today everything is fine. started up and i have lost connection to the internet.
Network Preferences is showing that Airport has a self asssigned IP address and cannot connect to internet. The time capsule lights are showing green, as do the Modem, neither are reporting problems.
I have tried all of the "first Aid configurations" i.e. switch off/on etc, also tried a couple of ideas from forums, nothing works. I can connect the Mac directly to the modem via cable and access the internet.
As an aside, My iphone has also lost connectivity through home wifi.
It would appear from other forums that this is a growing problem, however not much in the way of resolution. Any Ideas????

System Preferences/Internet & Network/Network
Unlock the padlock
Locations: Automatic
Highlight Airport
Click the Assist Me button
In the pop up window click the Diagnostic button.
System Preferences/Network- Unlock padlock. Highlight Airport. Network Name-select your name. Click on the Advanced button. Airport/Preferred Networks-delete all that is not your network.
Place a check mark next to "Remember networks this computer has joined." Click the OK button and lock the padlock. Restart your computer.
Mac OS: How to release and renew a DHCP lease
*No internet connection (wireless)*
Check to see if an extra entry is present in the DNS Tab for your wireless connection (System Preferences/Network/Airport/Advanced/DNS).
Delete all extra entries that you find.
Place a check mark next to "Remember networks this computer has joined."

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Hello mnkyby. Welcome to the Apple Discussions!
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~~~~~~~~~~~~~~~
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I've seen a lot of posts but I still can't connect wirelessly via airport extreme.
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Robin Berman wrote:
I still can't connect wirelessly via airport extreme.
Using a Powerbook running 10.6.4
That's not possible. Do you mean "MacBook"?
I ... have a full signal strength, but I can't connect to the internet.
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http://discussions.apple.com/thread.jspa?messageID=10695921&start=1
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Lost connection to internet through airport

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