Mac Mini Airport Extreme - Cannot detect any wireless 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 (10.4.9)  

It still may be possible that the antenna wire is not placed properly within the Mini. Here are an excerpt of the DIY instructions for installing the wireless antenna. Hope it helps...
- Make sure that the antenna cables are firmly seated in the mezzanine board.
- Pass the antenna cables through the gap at the rear of the internal frame.
- Carefully lower the internal frame down onto the motherboard. Make sure that the wires are routed to the right of the interconnect board.
- Snap the AirPort antenna onto the black plastic column next to the rear port panel.
- Tape the AirPort antenna wire to the edge of the DVD drive.

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    Hello,
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