and indeed connected (in the slot squarely and firmly) then the connector board or the logic board is a fault.
You did not say what caused you to purchase a new wireless card... if it was loss of wireless functionality then that could have been the problem all along. In which case you need a new logic board.
before you send that card back, there is a software app. from Apple that you need to enable N networking (if it wasn't OEM) if that's the issue.
If this answer is acceptable please return and mark it.
Good Luck,
N.
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1