If its an internal, try re-seating it. and be carefull when tightening the screw that the opposite corner doesnt lift slightly in a see-saw manner. if no joy, try it in another slot as the one it's in might be dodgy (assuming it's a PCI card).
if its an external and you still have an internal, try disablig the internal on in dev man. thinking about it, better remove it from the system alltogether.
these are the first things that spring to mind, and they will not cost any money to try.