If you don't see the screen being projected, press the laptop's special key combination after boot to activate its HDMI port. Press the "Power" button on your computer to turn it on and start the boot process. Press the Source button on the Optoma projector or its remote until the HDMI input to which the computer is connected is selected. Wait for it to warm up and start displaying images.
Press the "Power" button to turn on your Optoma projector. Plug the other end of the cable into the laptop's HDMI port, taking care to ensure the correct orientation. The flat cable has a protrusion on one side, so you must insert it the correct way however, don't force it. Plug one end of the HDMI cable into the HDMI input of the Optoma projector. 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.Press the "Power" button on the laptop and Optoma projector to turn it off. 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.
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. When the cable is unplugged, that disappears. 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. 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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