Cannot Connect MacBookPro to Router via Ethernet

I just bought a new modem/router and attempted to set it up using this MBP running on Mavericks via ethernet cable.  Each attempt when I typed the modem address into Safari, the blue line stuck and the MBP could not connect.  To avoid any conflicts, I turned wifi off.
I then tried my wife's MBP which runs OS 10.7.5 and this worked with no problems at all.  I then went back to using my Mavericks, but it would still not connect.
Can anybody offer a solution?
Thanks,

On the Mavericks Mac you could try deleting the existing Ethernet connection in System Preferences>Network using the '-' button. Save the changes and then create a new Ethernet connection using the '+' sign.

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