Got an issue with the old HP Desktop. Found this on my network connection. Tried another known good cable and still no go. Uninstalled the ethernet adaptor, reinstalled it. Still the same issue. Thank God for the laptop! Got a couple more things to try, but may have to buy an ehternet card for it. This one is on the mother board.
Also, all other computers are working fine off the router, including this one. It's wireless!