I am working in a building trying to troubleshoot why a series of 5 confernece room TVs (all Vizio E370-E3) are not able to display anything from a connected laptop. I have two laptops, both running Windows 10, that I am testing with, and have found that one laptop (Thinkpad SL510) will always work, and one laptop (ProBook 440 G3) will always fail. Each HDMI cord is about 25-30 feet long. And with every TV, and every HDMI input for them, the Thinkpad will work without issue, and the ProBook will not display anything. The ProBook is able to detect that the TV has been connected, and the TV sees that there is an input (the "no input detected" message disappears), but no image is ever displayed. It simply stays a black screen. What are possible reasons that one would work while te other wouldn't?