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Here's another method you can use.

Create a new layer above the image.

Use your Polygonal Lasso Tool to make a selection of the screen.

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Fill the selection with white.

Hit Cmd/Cntrl + D to deselect.

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Open the image you would like to appear on the monitor. Make sure it's the uppermost layer.

You may have to use the Free Transform function to re-size the new image to fit.

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On the new image layer, right click and select "Create clipping mask"

Done

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If you want different images to appear on the monitor, just add them to the stack and use the clipping mask.

The uppermost layer/image will appear on the monitor until you turn it off.

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