Mega 2560 wont receive commands to double stack row

I've been using an Mega 2560 for a school project that I've been trying to complete, but the double stacked row on the end won't accept any commands from the arduino system itself. If anyone can get a response to this in ASAP, that would be helpful.
Screenshot (2)

Just what is this? You will also have problems with serial flood (the arduino can send data faster then the IDE can adsorb it). This can cause problems programing as the programmer cannot get control of the Arduino.

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