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. However, you will also need to use an alternate method to send sound from your laptop to the projector, as VGA does not transmit an audio signal the way HDMI does.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. If your laptop and projector both have VGA ports, you can connect them with a VGA cable and no adapter. VGA: This is an older video connector that is limited to a resolution of 640x480. Some projectors do support USB-C video input, though, in which case you can connect your laptop directly to the projector via a USB-C cable. USB-C: If your laptop uses USB-C to output video, you’ll typically need to buy a dock that includes an HDMI port or a USB-C to HDMI adapter.If it does, then you can either use an HDMI-to-DisplayPort cable or an HDMI-to-DisplayPort adapter. DisplayPort: These are more commonly on desktop video cards, but your laptop may have one.You can use a cable with HDMI on one end and HDMI type-c on the other or an adapter.
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