Several general reasons can cause your projector to not display correctly. These issues can encompass various aspects of the projector, its setup, or the devices it's connected to. Here are some general reasons why a projector might not display:

1. Check Connections & CablesSecure the cables. Unplug and reconnect both ends of your HDMI or USB-C cable.Test ports: Try connecting to a different port on a different device.

2. Make sure the projector is powered on and not in standby mode. Ensure your connected laptop, streaming stick, or computer isn't in sleep mode or displaying a screen saver.

3. Check if the correct input source is selected.

4. Re-plug your laptop and wait a few seconds.

5. Access the display settings on your laptop not displaying on projectors and confirm the appropriate display mode.

6. Leverage function keys, such as "Fn" in conjunction with the corresponding F-key on the top row to toggle between diverse display modes, and ensure compatibility with the projector.