Completely lost all internet connection on brand new MacBook Pro

2 week old 2011 17-in MacBook Pro, running Lion (factory installed). I should note that this is my first Mac, so I'm still learning my way around, however it's highly unlikely I did anything to cause this to happen.
The problem is pretty simple - I have lost all internet connectivity no matter what method it's connected. I have tried it on my company network via ethernet, and several different WiFi networks. All connections are recognized as connected, but I cannot make any outside connection.
We've rebooted networks servers, rebooted/shut down the Mac, re-checked all of the network settings - everything is what it should be.
Everything literally was working perfect one second and completely lost the next.
Any help would be greatly appreciated!
Thanks in advance.

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