[Logichead]

I would suggest a few things, not in this order necessarily!

Create a system report in “About This Mac” with D Command connected and see if it sees the device. You can also try using LanScan to see what’s connected to Ethernet.

Replace the cable. Be sure it isn’t an Ethernet crossover type of cable.

Connect another Ethernet device to the Mac to be sure the Mac Ethernet is working.

Initialize the D Command and try again.

Let us know what you find!

Best...H