Macbook pro wifi internet not working

Hi Everybody,
I am recently getting a problem with Wifi. I am using Macbook Pro 13 mid 2010, upgraded from Mac os x lion with wifi patch update. It was working fine, but suddenly my internet stops working. Here is some solutions I already tried:
1. I already tried reseting safari
2. Prefrences file deleted from Library
3. Router has been factory restored, still problem persists.
And one more thing, I am successfuly able to connect the router, can even ping it, but If I try to surf with any browser or even ping any website, nothing works!
Please help me!

Try the following:
Open network preferences.
Select your WiFi card on the left.
Click "Advanced"
Click "Proxies" tab.
Enable "Automatic Proxy Configuration"
Close Network Preferences
Quit Safari.
Reboot your Mac and try again.

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Macbook pro wifi internet not working

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