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First of all you don't need to disable the onboard adapter just move to cable over to the new one.
As for why its not working are you connected directly to the modem? If you are this has to do with the MAC address some ISP do this automatically by turning off your modem & computer for about 5 minutes others you have to call up or login to say your MAC have changed.
Or you can copy the MAC from the onboard adapter and enter it in advanced properties for your new card in device manager.