Can connect to base station but cannot browse the internet

Hi,
I have got a MacBook 2GHz Intel Core Duo with Leopard installed (10.5). I have had trouble free wireless internet access for the last 12 months using a Belkin ADSL Router.
Just today I have lost access to the internet completely for both wireless and ethernet.
When I look at the Network dialog for either Airport or Ethernet it says that it is connected and it has got an IP address assigned by the router within the range I would expect. When I use the diagnostic utility it says that everything is fine.
I can browse to the admin pages of the router no problem.
I have reset the router numerous times and also tried the reset of the Mac where you take the battery out and hold the power button down for 5 seconds.
Nothing has worked.
I have got a PC connected to the same router and it is connecting to the internet fine.
Any ideas??

Jon,
Some other thoughts occurred to me...
When did this start? What change, if any occurred just prior to the onset of symptoms?
Have you recently upgraded to Leopard? Did it work after that?
Have you tried connecting to the internet on another wireless network like an internet cafe or a friend's house?
Does your PC, which works, rely on proxy settings to browse through?
Lastly, you asked if your ISP could have caused this. Normally, I would say no because you are connecting to your ISP through a single point and IP address, that of your router. While many ISPs have always wanted to bill their users by the number of computers that are using their services, this has been difficult to do because of the prevalence of IP address sharing granted by the routers that are so common in our homes. It may be possible that your ISP has found a way around this but I remain skeptical.
Sean

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