Hello Danny,
Thank you for the suggestions. The link you provided gives me a 404 ...
On the other suggestions, did not work. Keep in mind that the KVM was working fine before I had to power down everything and put together again. In any case, video still does not come through, but the USB connection works fine and can use keyboard controls to switch between computers ....
All the cables I use are DVI-D and as I said before, exactly the same set-up was working fine before having to take down things. That is why I am wondering whether there is some troubleshooting utility that will allow me to see if there is something wrong with the KVM itself and needs repair/change. I have trying powering down, reconnecting, rebooting, a number of times, always with the same result. Video through the KVM does not work, but USB does!
Thank you!