Most common questions used to investigate
Are you watching a particular movie or playing a specific game on your PC?
Are you using a wide-screen LCD?
Are the black borders located at the sides of the monitor?
Are you using optimal screen resolution for your display?
Are you using Windows 10 edition on your PC?
Are your Graphics and Monitor Drivers updated?
Have you recently installed programs on your PC from a particular website?
Do black borders appear once you turn on the monitor?
Do you have any corrupted and junk files on your PC?
Common conclusions
Some movies or games do not support the full-screen view; hence, black borders can be seen on the monitor.
It can be that your PC doesn't support a widescreen format. You can try to change the aspect ratio to fit your display. Try checking the resolution of your screen. Go to your Settings and go to the Display option. Go for the “100% Recommended” under the Scale and select Recommended setting again under Resolution.
Check if you have an auto-calibration on your monitor as it will fix the problem automatically.
Ensure you are using the optimal resolution display. Type in the exact make and model number into Google and research your monitor’s specifications online. Set the monitor into that particular resolution and frequency.
Sometimes, Windows 10 does not support an optimal resolution; that’s why you see black borders on display. In that case, you can try to download the video card driver to fix the problem.
Download and install the Windows 10 Anniversary Edition to support a broader range of display frequencies on your PC, which was not accessible on the earlier version of your PC. Verify that you have installed the latest driver.
some instances conflicting programs on your PC are causing your monitor to display black borders. In order to identify which particular program is the problem, you need to put your computer on a Clean Boot State.
Try choosing the “Reset This PC” option and perform a hard reset on your PC to restore Windows 10 factory settings without losing any files.
Try installing antivirus software that can eliminate unwanted files from your system and fix corrupted registries. This will help optimize your PC’s overall performance and fix the problem.
Try to download a repair tool to identify and fix the Windows error automatically quickly. If the downloaded program doesn't help, bring your PC to get checked by a professional.
References
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