Mac mini will lock up with ethernet connection

Hi,
I've bought a mac mini intel intel 1.83GHz dual core with 2GB of RAM (RAM from apple, the mac mini came with the 2GB installed)
If I don't connect the ethernet port, everything seems ok.
I have connected the ethernet port to get internet, but while I was downloading the software updates, some of the downloads failed. Then if I go to the system preferences/network and double click on the ethernet configuration, the system will lock up (I cannot launch any more new application, I cannot even shutdown, Finder will display empty hard drives and so on) and if I run the Terminal before and do a "top" I can see that the kernel tasks reach 100%. But no kernel panics.
I've tried a different ethernet cable (actually the one on my mac mini ppc) and it will still fail. Both mac mini ppc & mac mini intel are in the same kind of network configuration.
There was 2 times where the computer locked up at around 10.7 MB of download of 10.4.8, and one time I was able to download it all, but I'm still not able to manage to download every other updates. That to say that it may lock up at some random time.
I did a complete 10.4 reinstall (erasing hard drive), and managed to update the EFI firmware, but this didn't solve the problem. I also tried to let it of 15 seconds with no power cable, and put everything back, but it is still the same.
So what I see at the first glance would be :
- internal ethernet card problem
- some weird memory problem
I would like to test the memory, and I remember there was a "apple hardware test" CD before on its own. As far I've seen I only have the 2 CDs for MacOS 10.4.7 reinstallation.
Please give me some advice before I go to an apple center.
Thanks
mac mini Mac OS X (10.4.8)

You can run the hardware diagnostics from the Installation disc.
Insert the disc, restart the Mini, and hold down the D key while the Mini starts up again. This will allow you to run the diagnostics.
The hardware diagnostics will detect only the most obvious memory problems. It may miss subtle problems.
I think you probably have a defective Mini. But before I took it back to Apple, I would try it in a different building with a different internet connection and different electrical power. It is possible that the electrical power in your building is the source of the problem, or it is possible that your router or modem that connects to the internet is not compatible.
I would also try turning off all the equipment. Then turn on the internet router/modem and then the Mini about 3 minutes later.

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