Jeff and Chris were here today from Comcast. They believe they have found the problem and it was Comcast all along. We now have an extra modem as the previous Comcast repairman convinced us the old one was dead.
It wasn't the modem. It was problems outside up a pole.
So anyway, my frustrations have been solved (they think).
For my readers, I'll try to post more now. But I am to the point where I need someone to help me and who might want to research my drawers of materials or maybe take my files when I retire (again).
Thanks for reading me.