My Port Blocked

Hi wondering if anyone could help me out here, whenever I plug in my second Sensor into the Circuit board plugged into the arduino board my port just blocks out of nowhere. It's the third wire I plug in, whenever I plug it out my port unblocks itself. Is it the wire or is it my sensor.

If anyone could help me out here, please do!

Thanks!!

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https://forum.arduino.cc/index.php?topic=149021.0

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With the information you provided my only suggestion is to try swapping out wires.

Thank's that really fixed it!