black screen on external monitor after resolution change

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PL_CY

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i am using window 10 on a laptop.The laptop is linked to Blackmagic ATEM television studio HD video mixer, and is further connected to an external monitorThe resolution on the laptop is set to 1920 x 1080, and it is set to duplicated display. Both the laptop screen and the external monitor screen show the same visual. This is the original setting, and this is the ideal result for us.An user in our team accidentally switched the 1920 x 1080 resolution to another resolution setting, and the visual on the external monitor instantly turned into a black screen. After that the user immediately

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