No connection to the board "Step 3: Connect your Arduino"


Help. I powered up the Arduino Uno with the 5100 Ethernet Shield, USB and Ethernet cables are connected. Library is installed. Authentication code is correct, Windows 7 PC port says COM5 (Arduino/Genuino Uno). All lights are flashing.
Yet, it says Waiting for board to connect…
Serial Monitor is blank.

All libraries installed (CayenneLPP and CayenneMQTT)


can you share the code you are using.