Perhaps one of those settings also disables screen sharing over HDMI? I've looked through them and tried changing back quite a few, but nothing is helping so far. Thus, I wonder, are there any settings in the operating system that would disable the HDMI output? A few weeks ago, I changed a number of settings in Settings -> Privacy to disable unnecessary reporting to Microsoft and to disable unnecessary sharing of system resources with apps. Those options disappear when the cable is unplugged. Equipped with HDMI, VGA, AV, and USB interfaces, it can be perfectly connected to smartphones, laptops, pads, USB drives. Multiple Devices Connection & PortableOur portable movie projector is fit for playing videos, photo sharing, football matches, etc. Also, only when the HDMI cable is plugged in, I have additional options on the Display settings page, about what to do with the second display, such as mirror the primary display. Connecting to external speakers will achieve a higher sound quality If you want. When the cable is unplugged, that disappears. WiGig wireless displays Wirelessly connect your PC to a monitor, projector, or other kind of external display that is connected to a WiGig dock. Follow any additional instructions on the screen. When I enter Settings on my laptop (Start -> Settings -> System -> Display) while the HDMI cable is connected, I get a blue rectangle on the Display settings page that has a "1/2" displayed on it. On the right side of the taskbar, select the Network icon > Cast, then select your display or wireless adapter. We tried uninstalling and reinstalling my video driver. We tried rebooting both laptop and projector in various orders. I tried my laptop again, and it still didn't work. I tried a colleague's laptop, and the projector worked fine with that other laptop. Now, almost two years later, when I tried to do that again, the projector showed only an empty blue screen. When I taught at school before coronavirus, I used to plug an HDMI cable into my laptop, and the machine in the classroom would share my laptop's screen image through the projector.
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