iMac freezes when connecting to network

Hi all!

I have an old iMac (model a1224 - 2008-2009) and I got a RAM upgrade for it to 4GB and a new 1TB hard drive.
I've installed a fresh Mac OS X 10.6 (kernel is 10.0.0) and everything seems to be fine with the installation, the OS runs smoothly but I detected that when I tried to connect to any WiFi network, the OS just freezes, I can't do anything and I just see the spinning wheel, so I can only do a force shut down.

I thought it might be something related to the Airport card, so I removed it completely and I tried the same but with an Ethernet cable, and it happened exactly the same.

So discarted the Airport issue, it looks like it's a general issue related to any connection, when I start up the computer I can run any program and all just works! Issue appears anytime I connect it to any network, wireless or wired.

I've searched quite a lot on the internet but I can't find any clue, so I'm running out of ideas.
I would appreciate any help!

Thanks a lot.
Pablo

 

Yes, it is 10.6.0.

I have to say that I found out something to make it work, not sure if it will be just a workaround or a final solution, but I set an static IP (I thought it might be something related to DHCP) and in the same time I changed the priority of the network cards, and I set Bluetooth the last one, whereas Ethernet the first priority.

Enabled back the interface and worked, I even restarted a couple of times and Internet was still there without no freezes.

If it appears again I guess I'll install 10.6.8

Thanks for your response!