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Answer to "Why Airport still has no functionality?"You should see two 'U' marks on the cable. Point those toward the Airport card when inserting the cable into the Airport card. If it's not showing up, and you're really sure both Airport cards are good, you're looking at either that cable, or the logic board. EDIT: Sorry, I took a while to answer. Agreeing with Tim.
Answer to "MacBook Topcase brown cable and silver cable replacement"The connectors on all MacBook top case cables should be interchangeable - are you sure neither of yours are damaged?