How to fix the black border on the sides of the monitor?

Your monitors have a black border on the inside that gives the impression that part of the screen is missing. Normally, this only occurs when using HDMI to connect screens.

When utilizing a high-end computer monitor, such as a top-rated 1440p monitor and a PC to run Windows 10 and equivalent operating systems, one of the most annoying problems is the emergence of enigmatic black bars on the edges of the display. It can be very unpleasant to use a device that starts to display these unsightly black bars after doing extensive research and reading numerous monitor reviews. Continue reading to learn how to fix this problem.

However, it's a very different problem if you notice vertical lines on your computer monitor. Before attempting to troubleshoot, make sure you can discern these lines apart from the black bars on the monitor's sides.

Potential reasons:

In most cases, how the aspect ratio settings on the computer and the display combine to produce these black bars is the main cause of the problem. Although there may occasionally be other reasons for the dreaded black bars, it is the most important thing to look at.

A screen uniformity mistake may need to be fixed if one side of your screen appears darker than usual, which is distinct from the problem with the black bars on the side.

Your resolution is higher than what the monitor can handle.
Auto calibration of the monitor is required.
You must stretch your wall covering.
If you are utilizing an ATI graphics card with HDMI monitors, you must modify your scaling choices and overscan settings.

How to Correct It :

You may occasionally receive a black border if your resolution settings allow you to set it higher than what your monitor can handle. For every monitor, adjust the resolution to the (recommended) level.
On the front of the monitor itself, check for an AUTO button or a button that functions similarly to calibrate the display. As these buttons are frequently difficult to traverse, you might need to consult the user manual for your display. However, an AUTO button is typically present on monitors for this reason.
To make your wallpaper fit the screen, you might only need to stretch it. If your mouse moves into a black border, that is useful even if it has a black border. For instance, in Windows 7, select Desktop Background Settings and modify the setting to FILL the screen.
If you're utilizing an ATI video card and connecting your monitors using HDMI cables or adapters. There is a setting in the ATI Catalyst Control Center program that can address this problem, which has to do with what is referred to as Overscanning or Scaling.
Using the suggested display resolution: Make sure you're using the proper display resolution as your first line of defense in the fight against Windows 10's black border issue. When you discover that your screen has black borders on the sides, try this remedy most of the time.
Right-click any empty spot on your desktop, and then choose Display settings to view the resolution of your screen. Check to see if the recommended screen resolution is being used by scrolling down to Display resolution. If not, widen the dropdown and select the suggestion Windows offers.
Display driver updates: The issue may occasionally be resolved by updating the display adapter's drivers. Select Device Manager by performing a right-click on the Start button to do that. Expand the list under "Display adapters", and then click the device you want to update, and from the context menu, choose Update driver.

Select Find drivers automatically to simplify the process. By doing this, Windows will identify and install the finest display adapter drivers that are out there.

In Catalyst Control Center, modify this parameter as follows:

Open Catalyst Control Center by doing a right click on the start menu's Desktop or Programs tabs.
Activate advanced mode if it isn't already active.
Select Graphics from the drop-down menu in the top right.
Choose your displays and desktops.
In the bottom right corner, next to "Please Select a Display", right-click the display that is now active.
Choose Configure.
After that, click on the Scaling Options tab.
Simply shift the scale to the right (overscan) until the screen fills completely (usually, it is 0%).