MacBook 2008 wifi suddenly stopped working and says no wifi hardware. Took it to an apple shop, they said it could be the airport card but wouldn't do anymore then that.  Any help on how to fix this? How do I know if it is the airport card or not?

MacBook 2008 wifi suddenly stopped working and says no wifi hardware. Took it to an apple shop, they said it could be the airport card but wouldn't do anymore then that.
Any help on how to fix this? How do I know if it is the airport card or not?
is there anything else I can try first?
thanks

If the technician at the shop is competent, he has given you a diagnosis that should have identified the problem.  You could run the Apple Hardware Test to verify the findings:
https://support.apple.com/en-us/HT201257
Note the Apple Hardware Test is not definitive.
Go to the iFixit.com and Powerbookmedic.com web sites.  They have parts and installation instructions.  To install an Airport card is fairly easy.
Ciao.

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