Hello,
I have an hp laptop running windows 10 connected to an acer monitor as a second screen. now when I connect them, the laptop works as normal and the acer monitor shows the laptop background and taskbar at the bottom, all in good resolution and without really flickering. If I try to drag anything over to view on the second screen, it goes black with some white flickering at the top. I have updated all the drivers and tried two (cheap) hdmi cables to no avail. I don't really know much about what I'm doing, so any suggestions would be greatly appreciated!