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I have a Mac Mini and just upgraded it to Mountain Lion. It always displays the following:

I tried to follow the instructions on the following page, but it didn't help: Fix OS X Mountain Lion Wireless Connection Problems

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What was the part about your iPhone? Isn't it able to connect to the WiFi router either? – slhck Sep 19 '12 at 14:10
up vote 0 down vote accepted

Does your system have a "Profiles" preference pane? If so delete any profiles that are in there and it should disappear. Then you should be able to connect to a Wi-FI network again.

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