Why can't I connect with internet cable?

With my old macs, if someone had an internet cable, I could plug and go. But with my LION, I'm not able to connect easily to the internet. Can someone tell me why? I've run the network preference diagnostics and that doesn't help. Also, I turned off my firewall and that doesn't help either?

If it works with another computer it should work with the mac running lion.  I would suggest going to network preferences,  Select ethernet, and then click on the little settings gear icon at the bottom left and make sure that it isn't set to inactive.

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