IMac 21.5-inch Won't Remember WIFI Networks

Hello. my not-even-1 old iMac 21.5 inch form may 2011 has another problem. It just started happening today. I turned on my iMac and started to use safari, when it said I wasn't connected to the internet. I looked up ath the top-right corner and none of the WiFI bars were filled. I put it back on my router and countinued on. I turned it off a little later, and came back and it did the same thing. I was starting to get concerned, so I reconnected and restated my iMac. It did it again. I read that repairning disc permissions is the best way to fix it. I tried it, but it did not work. Is my iMac broken? Also, it is using a 2.5 GHz Intel Core i5 and is running Mac OS X Version 10.7.4.

My troubleshooting goes:
1) reboot
2) go to activity monitor in utilities and see what processes are running, there may be a surprise there
3) look for the last several things I put on my computer to see if there is a conflict. I once downloaded something that had me going for hours, as the application downloaded shouldn't have messed things up, but it did.
Check that something like the memory isn't loose, go into "about my mac" and make sure everything checks out.
I have had iMacs for over ten years, and one thing I have learned is to trust my computer. All problems were software problems that I caused myself.
Well, if you have Applecare, they can usually spot the problem, though the process takes some time. But I am not an expert, just someone who has had iMacs for a long time.
Hugh

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Hi
thanks for your reply
but this is what I see in wireless lan setting page :
Link to image
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IMac 21.5-inch Won't Remember WIFI Networks

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