Can you be more specific?
Do any lights come on?
Yes, the LED VIN, +5V and +3.3V were on.
Have you connected it to USB?
No, as I never used the USB connection before.
When and where did you purchase it?
I bought it at Filafarm on the 26th of August 2021.
Please follow the troubleshooting steps here and let us know how it goes.
As it is really not my first Duet Ethenet Board I used, and the other one worked without problems, I did not investigate any more. Furthermore the machine is located at my customer's place so I can not go there just for testing..