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

Community Help With My Project
1

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)

2

can you share the code you are using.

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