Lost Airport Internet Connection

My wireless network/internet connection is no longer working and Applecare is telling me they are not allowed to assist b/c of legal issues with internet providers, so I'm hoping someone here can help me?!
I use my iMac as a base station for my MacBook Pro to connect to the internet using the Airport and it is no longer working.
My iMac is connected to cable modem (Best Data CMX300V2) through Ethernet and the internet connection is working fine, however the triangle airport icon at the top right of my desktop is now gray with a box inside it. When I got into System Preferences>Network, the iMac Airport is ON, but now saying "AirPort has a self-assigned IP address and may not be able to connect to the Internet".
When I go into System Preferences>Network, for the MacBook Pro Airport it says it's connected and lists an IP address, but I have no internet connection. The MacBook Pro also has that gray triangle airport icon with the box at the top right of my desktop. I used Airport Utility to try to find the base station, but it was unsuccessful.
What is happening here?

Alright if your in desperado helpo then you will want to try and listen to this.
The MBP is built by ALUMINUM it's brushed and the metal screws have that problem with wireless. sometimes it will happen. I have both and that happends to me too. What I do is that your going to just have to go to the wireless sign and then click on Interfearence Robustness. If you do that. It should help more.
If you still have wireless issues try downloading APPLE CARE on your widgets. That always helps and that is where I usually go before I come to here for help.
I hope my info works.

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Darrin, just back from Montreal and glad to see that great minds think alike. Often, in fact usually, problems with airport connections can be solved by rebooting the router/airport. For no apparent reason, they often go all funny, and this usually takes care of the problem,
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Lost Airport Internet Connection

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