Apologies for the double posting - my first post ended up as a reply to a previous post.
I got up yesterday morning to discover I had no WiFi. My configuration is this: A SuperHub 3 in modem mode, connected to an Airport Extreme which in turn is connected by ethernet to two more AirPort Extremes.
I tried the usual things - I reset the SH3 into router mode, and established that I could connect to the internet wirelessly, but if I switched back to modem mode I couldn't connect to the internet either by directly connecting a computer to the SH3 or by trying to re-establish my wireless network. I tried 8 different ethernet leads, including 2 brand new ones. Occasionally I managed to get a cable connection but it wouldn't last long. I have also been able to try multiple computers.
It would seem to be either I am unlucky enough to have a lot of faulty cables or the port on the SH3 is faulty, or the SH3 is faulty in some other respect. I have ordered a cable checker and a couple of new leads but, in the meantime, does anyone have any brilliant suggestions of things I can try. I'd love to try a new SuperHub but Virgin don't make that easy. I spoke with them on the telephone on 3 occasions yesterday.
Thanks for taking the trouble to reply. I haven't tried any of the other ports - everything I've read indicated you can only use the lower port in modem mode. Mine is even labeled as such. However, I will give it a try. If that works I'll let you know.