Hi, I know this won't help but I am having the same problem. I have got a N750 and I am trying to set it up on my MacBook Pro. I have the N900 and I set that up at work using the same Laptop and that works fine. But I can't get onto the access to the setup wizard on the N750.
The only difference is that I have the modem then from there I have a Broadband spliter. I tried to plug in the N750 into the splitter and I din't think it likes it but I will try and plug it straight into the modem. But I had nothing plug into it and I still couldn't get onto the set up. I only got onto it once adn then it wouldn't load up anymore.