Hi @E_Corp. I suggest you try the follow steps so we can isolate the issue:
1 - Turn off your Duo and disconnect all cables.
2 - Turn on the Duo (still no cables - other than the power cable)
3 - Once the Duo is up try using the built-in menus see if it’s responsive
4 - Connect the USB cable to your computer
5 - Open the browser and navigate to the mod-ui (192.168.51.1 or modduo.local)
If this doesn’t work, disconnect the USB cable and repeat steps 4 and 5.
Do this whole process at least twice.
If nothing works, try changing the computer. If you still don’t get it working, try a new USB cable.
Let me know how it goes.