Lost Midi in

Today one of our guest entertainers using midi show control plugged in to our RHFB and now we have no control from any midi device. It was working yesterday, and no settings have been changed. I believe its a hardware issue, we think power was somehow sent through the grounding pin and since we work on a ship nothing is grounded. Is it possible to short out the midi in, or are there any other ideas out there?
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