Wi-fi icon greyed out and showing "No Network selected"

I have an iMac (20 inch; early 2009) running Lion and use an Airport Extreme as my router. The Airport Extreme is connected to my computer and all others in the home connect through it wirelessly.
Lately, if the Mac has been off or in sleep mode, when I wake it or turn it o, I'm still connected to the internet but the wi-fi icon is greyed out. When I click on the icon, it shows "No Network Selected" and then begins searching for a network. My network pops up as an available network, but I have to choose it each time.
This never happened until a couple days ago. I haven't made any changes to software, hardware, etc. and all software is up-to-date. The only thing I've done a couple days ago was a soft reset of the Airport Extreme, as my Apple TV was acting strangely. I pushed the reset button and everything was fine with the Apple TV.
No other devices or computers on the network are having any problem with the network.
Could the soft reset have done this? If so, what can I do get the wi-fi and the network to work together again? If not, any suggestions as to how to fix this?
Also, how do I determine the generation of the Airport Extreme? It was purchased in April/May 2009.
Thanks very much.
Sheri

Have you tried power cycling your wireless router? First step would be to turn it off, wait a minute and turn back on. Is this router supporting other wireless equipment, such as computers, and how are they working?
Do a hard reset on the iPad, hold both the sleep and home buttons until the Apple Logo appears.
Reenter all of the network settings manually.
Then try to connect and see if it is working correctly.
Problems like this can be hard to separate router issues from iPad issues until you try several things on each.

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