Finally found the issue. The switches have been set up as Spanning Tree (no idea why). So once I enable FastLink on the Netgear switch ports (or PortFast as it is also known) the network comes up...

I upgraded a Dell Optiplex 7020 with a Samsung SSD. Now when I boot the network doesn't get identified until I restart the NLA. I even tried a clean install of Windows 10 Pro and still no joy.
If I...