Basically, it's a software problem. Most likely a network configuration issue, less likely a driver problem.
First step, from a console try the command 'ifconfig'. You might have to be root. It should show all your current network interfaces, their ip addresses, and whether they're working (up) or not. It'll probably be listed as 'eth0' or something similar. If it's not listed, the driver isn't being loaded. Check the ip address and make sure it's what it should be. You might want to have a dhcp client installed to make things easier. It would also (probably) take care of a dns problem, which is another option.
You might also try pinging the router's ip address (if you know it, usually 192.168.0.1 by default), browsing to the router's ip address, pinging a site that you know will respond, etc. That should help narrow down the problem a bit.
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