No Ethernet Connection with Road Runner

Hi Everybody,
I have a bizarre problem. I just moved into a new apartment that is connected via Time Warner's Road Runner. Currently, we only have an ethernet connection via the Time Warner Router.
My MacBook (Model2,1 with 2GHz Intel and 10.5.5) connects easily with the ethernet. Open Safari and go! no problem at all.
However, the MacBook of my wife (Model3,1 with 2GHz Intel and 10.5.5) does NOT connect via the ethernet cable. I tried everything from new starts to entering IPs that my other MacBook got. There is no connection to the internet.
Any ideas why this could happen?
All the Best, Crobus

Are you using a router? If so what make and model? What cable modem do you have? Have you done the following:
Turn off everything including cable modem, router (if any), and the computers. Wait at least one minute. Then turn on the cable modem. Wait until the status lights show connection to the ISP. Then turn on the router. Wait until its status light shows connection with the cable modem. Last turn on the computers. Be sure you have Network preferences properly configured.
If the other computer still fails to get a connection then try deleting the following files from the /Library/Preferences/SystemConfiguration/ folder:
com.apple.airport.preferences.plist (if it exists)
com.apple.network.identification.plist
preferences.plist
Then restart the computer. You will have to re-configure the Network preferences.

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