Mac Mini Airport Extreme - Cannot Detect Any Networks

Hello,
Last week my Mac Mini (Power PC)'s hard disk crashed. So I did a DIY replacement. I managed to re-install all the software, and installed all the latest updates.
However, for some reason, the Airport Extreme is not detecting any wireless network after the re-install.
My own wireless network router is a third-party, which has been working well for the last 2 years. My Window PC and laptop still connects to it fine.
I can see the Airport icon but it doesn't how any detected networks (and there are quite a few in my neighbourhood). I did Apple Hardware Test and it shows the Airport card to be working ok.
Any help would be wonderful!
Regards,
Leng
Mac Mini G4   Mac OS X (10.4.8)   Sorry for the cross-post. I posted wrongly in Airport Express previously.

Hi,
Thanks for the reply. I saw the thread before I posted and I'm hoping this will be solved soon.
The main thing that worries me is that in my case, the Mac Mini is not even seeing any networks - zero in an apartment block where there is at least 5 network on the air at any time
Leng

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    Hello,
    Last week my Mac Mini (Power PC)'s hard disk crashed. So I did a DIY replacement. I managed to re-install all the software, and installed all the latest updates.
    However, for some reason, the Airport Extreme is not detecting any wireless network after the re-install.
    My own wireless network router is a third-party, which has been working well for the last 2 years. My Window PC and laptop still connects to it fine.
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    Any help would be wonderful!
    Regards,
    Leng
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