Windows 10: Line in the lower half of the monitor

everytime i put my monitor on 75 Hz below i see a line on the lower half of my screen everytime i put it higher than 75Hz It dissapear

:)

 

Lower half centimeter echoes top half centimeter in flashes

Hi, recently my SP4 started flickering in the lower half of the task bar at the bottom of my screen. Sometimes it decreases when I use my touchpad, but mostly it just sits there. Inside the flickering line you can see the top portion of the screen.
It seems as if the top half centimeter gets an echo on the lower half centimeter. It is very annoying when using the task bar... any fixes available ? thanks a lot !

 

Monitor - half of it is black

Running w10 and up to date as of June 7/20. Running 3 monitors. Middle one (NEC 3090WQXi large screen) only has half a screen showing. Done settings, monitor, checks. All scaling and resolution is correct. Uninstalled drivers for that monitor and for video
card and rebooted. No change. Unplugged and reseated video cable. No change. Unplugged power cable to monitor. Let it sit half an hour, plugged it back in, and then got full screen. Left it alone, screen saver came on, woke it up, and back to half a screen
(left half black). Repeated unplug and leave it, but now still at half a screen. All diagnostics in device manager say monitor is working properly - sadly not. The setup has been working well for ten years. Not sure if this is a result of them latest W 10
update. The one thing I have not tried is to roll back the latest update - I hate doing that in case it causes more problems.

I have run out of ideas. Any suggestions? Apologies if it is in the wrong section. There was no option for display issues.

 

Screensaver slideshow does not display correctly whith dual monitors set to "extend desktop"

Objective: I have dual monitors (as an extended desktop, side by side) and want it to show my own pictures as a screensaver slideshow in Windows 10.

Problem: Only the lower half ot the picture is diplayes in the top half of monitor 1. Monitor 2 is black.

Addtional observations:

• In "Screen Saver Settings" the small mock-up display looks fine, however when i select "Preview" the problem with only half the picture displayed occurs also in the preview.
• The problem does not occur with only one monitor in use
• The problem does not occur with dual monitors set to "Duplicate these displays"

Gratefull for all suggestions to solve the problem

The same picture also work fine as desctop background with different pictures displayed on each monitor.