Windows 10: Monitor breifly going black while 2nd monitor running?

I have 2 monitors running in my setup, one on HDMI 2.1 and the other on displayport 1.4. the HDMI one is recognized by windows as the 2nd monitor, but I've set it to be the main monitor I use.The problem comes, whenever I have something like a video playing or something else on my other monitor, every so often the screen on the main monitor would go black for a few seconds and then come back. This usually happens when there is a window on the other monitor, sometimes it happens even when there isn't anything and it most frequently happens when there is a window full-screened on the other monit

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2nd Monitor.

I recently bought a 2nd monitor and I connected it to my PC but there is a problem. The problem is that windows 10 has detected it and I have extended my display but my 2nd monitor wont display anything it just stays black. Can someone help me please.

 

2nd monitor not working

So i recently bought my 2nd monitor and i tried to plug thr hfmi in my pc but it was just black screen then i switched my 1st monitor hdmi to the place where my 2nd monitor hdmi was and it was again just black screen. is my hdmi ports brocken or do i have to update drivers or something else pls help

 

2nd Monitor

Hi

Thank you for helping me. When it is on duplicated both monitors have same resolution, however, the 2nd monitor the text is unreadable and screen blurred. If on extended my default monitor is fine but the 2nd monitor goes off and my laptop screen comes on.
I wish to have both default and second monitor displaying at the same time. As it is the 2nd monitor drop down resolution is showing 800x600 and is faded out and unable to change it.