Mac Mini crashes when airport is turned on

Hi
I have a mack mini from 2008 running leopard 10.5.7. It just crashed/hung the other day for no reason so i wipped the HD and reinstalled leopard after a long process of illimination. I had it working in safe mode prior to reinstall with no problems so i assumed this was a software problem. So after the reinstall everything works fine except for one thing. When i turn on airport it does exactly the same thing...just crashes and hangs. I have run out of ideas as to how to correct he issue. It's airport for sure and I have no idea why it's happening. Any ideas would be most welcome.
thanks

Thank you for the reply...I had already done the hardware test....but since posting if discovered this in an article and it works.
SOOOOO...here what this is....the airport tcpip settings(IPv6) needs to be switched off...it's as simple as that...
System preferences, Network, Airport, TCP/IP, Configure IPv6, SET IT TO OFF...and all good...
many thanks

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