1bd6e085-8184-4622-8431-7d004795cc52-image.png
https://docs.duet3d.com/en/Duet3D_hardware/Duet_2_family/Duet_2_WiFi_Ethernet_Hardware_Overview#led-indications
The LED between the USB port and the reset button is the USB power indicator. Do you have the board connected via USB at all times?
Is the board responsive to USB terminal commands?
For networking issues, it would help to know if you're using wifi or ethernet and what the contents of your config.g are.
It may help to go through this guide.
https://docs.duet3d.com/en/How_to_guides/Getting_connected/Getting_connected_to_your_Duet