Network diagnostics - can't connect through Ethernet...ps3 and old iMac work but I can't get this macBook online...help!?!!

Having a problem out of nowhere really getting this MacBook back online through Ethernet.....it's not the modem because my old computer gets online as well as the ps3.....I think it has something to do in network diagnostics but I can't get it.
Thanks!

hi there-
to determine which network port is being used go to the blue apple > system preferences > network and then on the show scroll menu select "network port configurations". then make sure the card is detected there, select it, and then deselect any unused network ports. (the rest of them). [ 8 ) ]

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