1.Disable the NIC in Device Manager
2.Shut Down the Computer
3.Power Cycle the Modem (Switch off the modem and unplug all the cables and reconnect after 10 seconds)
4.While power cycling just Swap the ends of Ethernet Cable.
5.Restart the Computer.
6.Enable the NIC in Device Manager.
7.Restart the Computer again if the OS is other than Win XP.
8.Create a Broadband Profile and Connect through that Profile.
9.It should work,if it is not,we have to change the Ethernet Cable.