Lost Network- Yellow Light Blink

I've had an Airport Network setup in my house for 1 year. It consists of an Airport Extreme 802.11n, Apple TV, and 3 Airport Expreses- one runs my printer and extends the range, the other 2 are setup for ITunes in different rooms.
2 days ago a woke up to find that neither of my computers (G5 and Macbook Pro) can find my network; however I still have excellent connectivity to the Internet. Additionally my Airport Extreme shows a steady green light except it flashes a yellow light one time every 30 seconds. ??? Does anyone have any ideas?

Progress,
I could not access the airport no matter what I tried.
Decided to take it to the office. Here a iBook and a Powerbook 17" saw the airport. I installed the network utility and while the airport was still blinking, they recognized it and I was able to configure it. When applying base station and network security, it stopped blinking yellow and turned green.
Now, I can see the network with the iBook (12 inch) and 17 Powerbook, but still nothing on the 12 inch Powerbook, no network and no airport. ***.
Jack

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    Progress,
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    Decided to take it to the office. Here a iBook and a Powerbook 17" saw the airport. I installed the network utility and while the airport was still blinking, they recognized it and I was able to configure it. When applying base station and network security, it stopped blinking yellow and turned green.
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