Intel iMac on Airport Extreme - NO UPSTREAM!

Within the last day I have completely lost wifi data uploading capabilities on my iMac. First noticed it when trying to upload to my iDisk. Using speedtest.net... no upstream. I have tested two Macbook Pros on the same network and they work fine.
Any ideas?

It would help by posting some logs of what is going on while you have the IMac in this condition. Open a command prompt and do sudo tail -f /var/log/system.log and paste it as a reply to this thread.
Have you tried turning the AirPort adapter on and off and/or rebooting?

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