This is not a Mac problem per se, but there are so many knowledgeable people here, someone may be able to throw some light on this.

Our broadband comes down the phone line, the existing router (which I'll call Router A) has always performed brilliantly as it should. However, we're about to try installing a wifi hifi system which needs greater wifi coverage in our home than Router A can provide. First shot was to buy and instal wifi range extenders, but these messed with Router A's functionality, which is unacceptable.

I therefore bought a new router (Router B), same mamufacturer, Mac-happy. However, installation failed despite repeated careful attempts.

Analysis reveals that the phone line - which works - will not accept ISP log on attempts. Yes I typed my ISP username and password exactly right. My ISP's tech help line today said they had had no failed authentication attempts from here.

I'm stumped. The phone line on the reinstalled Router A which works like a dream, clearly works. But it seems Router B is not recognising it? I have raised this topic on the router manufacturer's own forum but am getting nowhere.

Does this mean that my new expensive Router B does not work as it should, or is there something which my ISP, the other forum, and me, are missing?

Further details provided if necessary. Thanks for any helpful replied.