AirPort card has disappeared how to recover on mac os x 10.5.5

Hi all,
suddenly my Airport card has disappeared.... how can I get it back? I tried to restart the mac with opt command R-P but nothing... can some one please help this desperate mac user?? thank you so much.

In addition to running Hardware Test as suggested by Jolly Giant, have you tried reinstalling the 10.5.5 combo update?
As a side issue, is there a particular reason that you have not upgraded to 10.5.8? This might be a good time to do so.

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