All the devices connected to my Comcast Xfinity Router disconnect from the Internet when Dell XPS desktop is connected

Hello:

I've been having an issue with my Dell XPS Desktop (Intel Ethernet Connection I219-V Ethernet card).

When I connect this server to my router by an ethernet cable, all other other computers connected (Hardwired or Wifi connected) disconnect themselves from the internet. 

It happens only with this Desktop running Windows 10.

I was told to change the DNS address to the OPENDNS Addresses - I tried and I had no luck. I do not have the Ethernet card or the Desktop in powersave mode. They do not go to sleep when idle.

Can someone please make any suggestions. Any input from your end would be very much appreciated.

Kennedy