I was recently asked to help with some A/V stuff at my church. The goal was simple: Display HDMI video from a laptop to two LCD TVs. Since distance was an issue, I purchased an active HDMI-to-Ethernet converter. I've included a diagram for reference. When I went to plug the 3' HDMI cable from the splitter to the first LCD TV, a huge electrical arc occurred when I barely touched the HDMI cable to the back metal plate of the TV. This fried the LCD TV and the HDMI-to-Ethernet converter. I suspect grounding issues, but I don't know enough about HDMI to know if that could be the problem. How would I determine if grounding is a culprit here?