Linksys wrt54g v8 router problem

My linksys wrt54g v8 router has suddenly started giving me an error message "no internet connection" yet the network is working. I downloaded new firmware and still could not get past the same error message after resetting the router and trying to use the startup disk. It just doesn't recognise the internet connection. Yet it setup the basic network and that works, but will not allow me to set up the rest of the security, etc because of that error msg. Could this be a hardware problem? It also can't find the shareable printers that were working before.

Thanks for the reply. I have tried that several times and just tried once more and it tells me the network is working then goes to check status and comes back with"no internet connection". I am ready to just try a new router.......... Any other suggestions? Bob