Airport and ethernet not working other computers are

I have a Mac Mini that I use daily. Today when I tried to get onto the internet the bars for airport in the menu bar were gone and a caution exclamation point was there. I restarted and that did not help. I then plugged in an ethnet cable and refigured the mini for ethernet. that did not work. I know the modem and router are working just fine and so is the ethernet since I have other computers on my home network and they all connect ok. Is the airport and ethernet card connected in that if one goes out so does the other?  The mini is 2-1/2 years old. I have a Wii and a satellite box on the same shelf as the mini and they both connect to the internet just fine. is my mini toast?

In system preferences- network do you have show airport  status in menu bar checked. To the left in network does airport show up. at the top in nework is it on.

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