This question is not specified but it does not matter as I will try to cover every possible query you might have. In case no image is appearing on your projector at all, you need to consider the following steps to figure a way out. Offering just one solution won’t be enough especially when I am not even sure which one will work for you as I don’t know the details of the problem you could be facing. Yep I am super considerate, I know. Anyways, so here you go with the solutions.
Changing the display to external output only
If you are projecting from a computer, make sure it is set up to display on an external monitor. If the computer’s display is set to an extended or mirrored mode, try changing it to external output only.
Try turning on again
Turn off the projector and the connected streaming device or video source, and then turn them back on.
Are the remote and projector within range of each other?
If the projector does not respond when you press buttons on the remote control, make sure the remote and projector are within range of each other.
Active internet connection
If you are trying to view online content, make sure you have an active Internet connection.
It’s reset time (my fav)
If the other solutions do not solve the problem, reset all of the projector settings using the option in the Settings menu.
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Check the status light
Check the status light to confirm the projector is operating normally.
The HDMI CEC standard
Make sure the connected device meets the HDMI CEC standard. See the documentation supplied with the device for more information. If necessary, set the CEC function for the connected device again and restart the device. Turn off the projector and the connected streaming device or video source, and then turn them back on.
Was the image temporarily turned off?
Press the Blank button on the remote control to see if the image was temporarily turned off.
See the computer manual
Make sure the computer’s display resolution does not exceed the projector’s resolution and frequency limits. If necessary, select a different display resolution for your computer.
Make sure all necessary cables are securely connected and the power is on for the projector and connected video sources.
Standby or sleep mode
Press the projector’s power button to wake it from standby or sleep mode. Also, see if your connected computer is in sleep mode or displaying a blank screen saver.
Shorter HDMI cable
Try using a shorter HDMI cable.
Copyright protection and encryption
Check the video copyright protection and encryption. The projector may not be able to project copyrighted videos with updated or revised versions of HDCP encryption.
Try connecting the video source directly to the projector. These solutions are no different than what you will find from any other internet source. This time I could not write something different because the requirement was to share the solution and these are all there is for you to try. Helping you is the priority; I hope it does help.