After tightening that, and then reconnecting the Dell latitude, it worked flawlessly on the projector! However, when connecting the gateway, no matter what I tried, the projector would not display anything from that laptop. After inspecting the wall jack, I discovered that the HDMI cable that was in the wall had slightly come loose from the jack. I was using "Win Key" + "P" to change the modes. The issue was that when connecting both of the laptops to the HDMI port, neither laptop would display anything on the projector. The first laptop is a Dell Latitude with Windows 10, and the second one is a Gateway NV57xxx with Windows 7. Which is where both laptops have been plugging into. Then another HDMI cable runs from the panel box to the actual wall jack. The HDMI cable runs through the ceiling to a panel box in a closet.
First off, the projector is a newer BenQ MS517 projector mounted overhead. I was asked to help diagnose a recent problem with why two computers would not connect to an overhead project with the HDMI cable/port in the wall.
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