Macbook Pro 10.7.5 internet will not work. HELP!!! Ethernet and WIFI both say connected but still no internet.

I have a macbok pro running 10.7.5. My internet has always worked on it but I decided to try changing my router set up - the set up didn't work so I reverted back to the original setup that had previously worked.
Now, I have an Imac running tiger - I can connect to the internet via WIFI or Built In Ethernet with no problem.
When I try to connect to the internet on the Macbook Pro running osx 10.7.5 my internet will not work
Safari Says (You are not connected to the internet) and Google Chrome says (Page is Unavailbe) and lists some trouble shooting options that I tried.
When I go to System prefrences > Network my WIFI and Ethernet both say "Connected" and have a green light next to them.
I have tryed deleting the connections and starting new ones and I have even tried deleting the Location and starting a new one.
Nothing works - no matter what I do, even know the WIFI or ETHERNET says Connected, the internet will not work on the Macbook Pro.
The Internet works fine on my Imac and I have tried everything such as swaping cables but there doesn't seem to be a problem with my internet
or with my router - it all works fine with my Imac running Tiger.
Can anyone help me get my internet working on my Macbook Pro again? Any ideas?

Hello ASGR.SYS amd WahWar,
I tried both of your suggestions and neither of them worked.
ASGR SYS - When I tried it your way i got a message saying that the that the diagnostic couldn't repair the problem. It shows the thw WIFI, WIFI SETTINGS, NETWORK SETTINGS, ISP, all turn green. But the Internet and Sever stay red. The thing is, there is nothing wrong with my internet connection as I can connect to the internet on my Imac running tiger, both through ethernet and wireless. When I go to System Prefrences and Ntwork the WIFI and ETHERNET both say "Connected" even know I can't veiw any websites.suggestion
When I tried WAHWAR's suggestion I get a message that says cannot connect to the WIFI network and then it lists your typical trouble shooting tips. Like Make sure you entered the right password and make sure you are in range of the wireless network
Again, just to confoirm - My internet connection is working fne both the WIFI and the Ethernet. When I use it on my IMAC running tiger, everything connects as it should and it works perfectly. But when I try to connect with the MacBook Pro, Even know the connections in the Network settings window show up as "connected" the MacBook still seems to think that my internet connection isn't working at all.
I have tried creating new connections, creating new locations, and I have even gone as far to reset my router and start completely from scratch. The result so far has been the same - the IMAC running tiger will connect - my blackberry and iphone will connect - but the macbook pro running lion will not connect..
I'd apprechiate any other suggestions

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