Fix: Flashing Black Box in Windows 10

By: Ivan Jenic
2 minute read

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Now we’re going to talk about some strange and unusual error in Windows 10. Namely, a couple of users reported that while they were using their computer, strange black box started to flash on the screen. There are a few possible causes of his problem, and we’ll try to find proper solutions for them.

How To Fix Flashing Black Box Problem in Windows 10

Solution 1 – Check Video Adapter Drivers

By now, Windows Update should cover all your drivers, but if you’re using a display driver for which Microsoft doesn’t offer official update, you’ll have to update the driver manually. In case you’re not sure how to do that, just follow these steps:

  1. Go to Search, type devicemngr and open Device Manager
  2. Find your display adapter and right click on it
  3. Go to Update driver software Flashing Black Box in Windows 10
  4. If the update is available, just let the wizard finish updating

If Windows 10 isn’t able to find update for your driver via Device Manager, you can go to manufacturer’s website, and see if they offer some new updates for your display adapter. If you determine that drivers are not an issue, you can try one of the following solutions, as well. We also recommend this third-party tool to automatically download  outdated drivers on your PC.

Solution 2 – Repair Damaged Windows Files

Maybe some corrupted system files cause this black box to appear, so you can try with scanning your computer for broken files and try to fix them. Here’s what you need to do:

  1. Right-click on the Start Menu button and choose Command Prompt (Admin)
  2. Enter the following line and press Enter:
    • DISM.exe /Online /Cleanup-image /Restorehealth black box screen windows 10


      For various PC problems, we recommend this tool.

      This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

      1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
      2. Click “Start Scan” to find Windows issues that could be causing PC problems.
      3. Click “Repair All” to fix all issues with Patended Technologies (requires upgrade).

  3. Let DISM scan your computer for errors and find possible solutions (if you want to find out more about this tool, check out our article about how to use DISM in Windows 10)

Solution 3 – Repair LockAppHost.exe service

And finally, some users say that Lock Screen app can actually cause a black box on the screen. So, we’re going to reset the Lock Screen service, and see if the error appears again. Here’s what you need to do:

  1. First, open Task Manager, by right-clicking on the taskbar
  2. Find LockAppHost.exe and end task
  3. Now you need to re-register Windows Store Apps, so open PowerShell (go to Search, type powershell, right click on it, and open it as administrator)
  4. Enter the following commands and press Enter after entering each one:
    • PowerShell -ExecutionPolicy Unrestricted
    • Get-AppXPackage -AllUsers | Foreach {Add-AppxPackage -DisableDevelopmentMode -Register
      “$($_.InstallLocation)AppXManifest.xml”} black box flash screen windows 10

If you’re still having issues on your PC or you simply want to avoid them for the future, we recommend you to download this tool (100% safe and tested by us) to fix various PC problems, such as file loss, malware and hardware failure.

And if you’re still unable to solve the black box problem in Windows 10, you can check out solutions regarding screen flashing problems in Windows 10 here, as well.

Read Also: Disable Touch in Windows 10: How to

For various PC problems, we recommend this tool.

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues now in 3 easy steps:

  1. Download this PC Repair Tool rated "Excellent" on TrustPilot.com.
  2. Click “Start Scan” to find Windows issues that could be causing PC problems.
  3. Click “Repair All” to fix all issues with Patended Technologies (requires upgrade).

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