[UPDATE: I decided to try something although I didn't expect it to work. I unplugged the modem and plugged it back in again. this time it worked. Half an hour on the phone with the head techie and he never suggested that. Never mind. I'm still getting a new modem tomorrow... sometimes the answer is very, very simple. You just need to be stubborn, like me!]
New modem being rushed over & will arrive tomorrow.
Meanwhile, from the Internet café on the corner....
Be good to your friends -- Kevin Bacon.