How to Change the Projector's Default Background. I would like to change the default backgound from the Apple Starfield to plain black

I want to be able to change my projectors default background while using my mac book pro. Currently it is showing Apple's signature background. I would like to change it to a plain black background so that when I disengage mirroring the screen the audience sees will go black; thus allowing me to make any necessary changes/switch programs and then engage mirroring. Any suggestions besides using a video switcher?

It is Not an Apple projector; the image is being pushed from my mac book pro.

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