Windows 10: dual monitors duplicate but I cant get them to extend

i added a second monitor via hdmi adapter and both are displaying correctly however my pc wont detect the second monitor in order for me to extend it

:)

 

Problems while extending and duplicating on my second monitor

Hi there!

So I wanted to get a dual monitor for my laptop so I found a monitor at home. Its an NEC LCD monitor which takes a VGA cable for input. So I got a HDMI to VGA adapter, plugged it into my Laptop (Asus X510UAR) and it worked flawlessly. All the projection modes such as PC only, Duplicate, Extend and Second Screen.

But when i wend to adjust the resolution for the second monitor in the display setting, idk what i pressed accidentally, but now my second monitor shows a black screen during Duplicate mode and while extending to the dual monitors, the mouse cursor does shift to another screen, but the dual screen is still black(even though apps are working on it. And when i switch to only the second screen, the second screen works completely fine(Indicating that the hardware is absolutely fine)

I've tried with many forum suggestions such as changing the resolution of both the screens as well as changing the primary monitors and the configuration of both the screens and orientation as well but no luck. I've even tried changing the Microsoft administrator account to a new account to reset to the default setting but no luck there as well. And other ways to reset to the default setting weren't possible on my laptop.

Please do suggest what could be the possible ways to solve the issue which wasn't there when i initially started.

Thanks!

Windows Version 1903(OS Build 18362.592)

 

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.

 

External monitors extending issue.

I am trying to connect 6 external monitors to my laptop running on windows 10. I am using DVI-D dual-link to HDMI cable to connect the monitors to the HDMI splitter and HDMI to HDMI cable to connect the splitter to the laptop. There
is just one problem when I am extending the screens, the external monitors seem to duplicate themselves rather than extend. So instead of 1 to 7 for all monitors combined, all my laptop only detects 1 and 2. 1 being my laptop and 2 being all the other external
6 monitors. That means that all the external monitors showing me the same thing as in they duplicate and not extend. Any suggestion on it can be fixed so all the external monitors become the extension of my main laptop and do not duplicate?