Unable to connect to internet after router reset

Hi,
Am in need of some urgent help please - my MacBook Pro is unable to connect to the internet following a reset and reboot of my Belkin54g router.
Last week I was following some troubleshooting instructions to get my new Vodafone Sure Signal booster to work and it gave some instructions to alter settings in the router's IP configuration - all of a sudden I lost wireless connectivity on both my MacBook Pro & my Dell Laptop.
Last night I spoke to my ISP and they talked me through re-setting the router's settings and now the laptop is back up abd running and fully connected to the wireless and internet.
However, my MacBook Pro appears to detect the wireless, but not the internet connection. I asked the ISP to help but they said they would not help with resetting wireless settings on Macs.
So now i am stuck and don't know what to do. Please, please, please help.
Thank you!

Hi
I am having the same problem - all of a sudden from my wireless router I am seeing and connecting to the router but not the internet. I have checked to see if I am getting am IP address from the router and it seems that I am not.
If I connect with the old fashioned wire, it works fine.
Thanks in advance...

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