Wifi can't connect to home network but can to school network and via ethernet

My MBP cannot connect to any of my home networks (we have three, same ISP but not the same security) but it can connect to my unsecured school network and to my home network via ethernet cable. Other devices can connect to the network, including my iPhone, my fathers machines... etc.
I spent an hour on the phone with apple care and tried a large variety of things...
Changing my DNS settings to add 8.8.8.8 and 8.8.4.4
deleting the .plist settings in my system config folder
running diagnostics 500 times
restarting
reinstalling mt.lion (without wipe)
restarting the router
and a lot more.
Basically, it says I have full internet access and diagnostics tells me there is nothing wrong. Green light and everything but not a single program can connect to the internet while I can connect to home based servers.
I cannot ping anything and I cannot access any websites using either their IP or their domain name.
Needless to say, this has been getting quite frusterating and I'm running out of ideas.

Boot into Recovery by holding down the key combination command-R at the startup chime. Release the keys when you see a gray screen with a spinning dial.
From the OS X Utilities screen, select Get Help Online. A clean copy of Safari will launch. No plugins, such as Flash, will be available. While in Recovery, you'll have no access to your saved bookmarks or passwords, so make a note of those before you begin, if they're needed for the test.
Test. After testing, reboot as usual and post the results.

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