Why won't my wired local area connection work but my wireless connection will?

I have a compaq presario c700 and my wired connection doesn't work anymore. I've formatted at least 5 times, and have tried several different operating systems (vista, windows 7 beta, xp, and ubuntu linux) and it still doesn't work. When I connect my ethernet cable (I've tested it on another... show more I have a compaq presario c700 and my wired connection doesn't work anymore. I've formatted at least 5 times, and have tried several different operating systems (vista, windows 7 beta, xp, and ubuntu linux) and it still doesn't work. When I connect my ethernet cable (I've tested it on another computer that the cable works) it lights up normal, and my computer recognizes it's connected, it just won't connect to the internet for apparently no reason at all. can anyone help?
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