Completely lost internet after upgrade over 10.7.4, Mac Mini

Hi Everyone,
I've upgraded from 10.7.4 on a Mac Mini bought late last year i5 2.3 GHz, 500GB HDD to 10.8.2.
I've now completely lost the internet.
My FreeNAS box started disconnecting intermitently and today, after a reboot, I cannot connect to the internet.
I've tried turning everything off, pluging the mac directly into the router, uninstalled tons of software, checked the console error logs, checked a few things via terminal and connect find any logical explanation. I've even swapped routers and cables with known working devices in the household.
At one point, I had two mobile accounts set on my home network with Windows Home Server 2008 R2 but these were not so active prior to the upgrade and I've checked settings here.
I consider myself good at network with most parts of the network set to LAGG except the Mini.
I'm really stumped.
Has anyone else experienced this?
I'm actually wondering if I've got a hardware defect and it's just bad timing with the update.
If anyone has any ideas, I'm keen to try things out but will be phoning Apple tomorrow.

Right, I've found the solution. I completely binned my 'SystemConfiguration' folder from the Library/Preferences and now it works.
What an absolute pain. Lost all my settings but can get back on the internet.
Got no idea what caused it and maybe I'll route through the folder to see what stopped it from working. It was working perfectly fine on Lion, every since purchase date.

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Completely lost internet after upgrade over 10.7.4, Mac Mini

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