If a black screen is being recorded by VBOX Sim, there a number of steps that can be taken to try and rectify the issue.
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An external capture card has most likely been detected as a new screen. Check display settings and set it to duplicate the centre screen, screen1.
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Check the screen resolution, an external capture card may only record up to 1080p at 30 fps.
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If using an external capture card, ensure it has been selected from the External Device menu.
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Restart the computer.