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Microsoft Windows 11

I press Windowa +P, but it does not work. Nothing happens when I press Duplicate og Extend. The projector only shows blue light, no image of my PC-screen. I use a HDMI-cable. Hav used the same cable connected to the same projector before, and it worked fine in the past. But not this time. I need it badly to work! But what can I do to fix it?

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