Projector Not Showing. Check that the display is turned on. If you're using hdmi, check to make sure not just that the projector is.
Windows 10 can fail to detect a projector if your drivers are out of date. why is my projector not working? There's a message show your pc cannot project to another screen.
Projector won't show computer screen [SOLVED]
make sure the projection screen is between the required distance 9.6 to 126.6 inches (0.245 to 3.215 meters) from the projector. Resolution of the laptop too high. Check that the display is turned on. Adjusting or changing the display mode.