I have a Dell Optiplex 9020 desktop that has a built in i217-LM NIC. I needed a second NIC so I added a Gigabit CT desktop PCIE NIC. After installing the Proset drivers the i217-LM NIC stopped working and the CT Nic does not work either. Both show up in the Network control panel but with a state of disconnected. The LED"s show link and network activity.
Any ideas of what happened and how to fix it?