''' 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.
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== Update ==
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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.'''
== If the card is new ==
''' 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.
'''If this answer is acceptable please return and mark it.'''
Good Luck,
N.