If only a partial computer image appears, try the following solutions:
Press the Aspect button on the remote control to select a different image aspect ratio.
If you zoomed into or out of the image using the E-Zoom buttons, press the Default button to return to the original image size.
Check your computer display settings to disable dual display and set the resolution within the projector's limits.
Check the resolution assigned to your presentation files to see if they are created for a different resolution.
Make sure you selected the correct projection mode. You can select this using the Projection setting in the projector's Extended menu.
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