I can't guarantee that this is the problem, but I've had issues in the past with two devices that operate on different subnets, and in my case it was 192.168.0.* and 192.168.1.*, just like yours.
Have a look to see if you can change one of the two devices to match the other. That's probably what you did some time ago, and resetting things to factory defaults undid the change.
Thanks. However, I don't see how I can correct the router since I can't get to its web page interface. I just bought some cables, and I have some new ideas to try tonight when I get home. I want to rule out Ethernet cable failure. It seems also that I have not done a complete router reset or the router was not properly reset by me. I will pay more attention today with a fresher view.