BenQ Video inputs stop working when near a Mill/Drill press

I have 2 BenQ projectors which now have issues with video inputs not recognizing any signal. The issue began when a large mill/drill press is turned on while the projectors were turned on. The HDMI 1 in both projectors instantly stopped working and no longer recognize any HDMI input. I moved the input to HDMI2, which no longer works. I then tried an HDMI conversion cable to VGA, initially the video works but once again after running the mill/drill press that input stops working entirely.

Obviously there is a connnection between the mill/press and the video board breaking, but any thoughts how to avoid this issue in the future? There will be times where i NEED to run the mill/press and run the projector at the same time. They're not even in the same room, but they're 15 ft away thru a wall.