windows pro 11 sandbox app suddenly is not working correctly

Question

windows pro 11 sandbox app suddenly is not working correctly. When it opens up it shows a black screen instead of showing the windows desktop.

Answer 1

Hi Kostas Valanos

I think when Sandbox opens to a black screen, it usually indicates a problem with virtualization services, graphics rendering, or corrupted system components. First, please verify that Virtualization Technology (VT-x/AMD-V) is enabled in your BIOS/UEFI, and confirm that Hyper-V, Windows Hypervisor Platform, and Windows Sandbox are all enabled under Windows Features. Next, I recommend updating your GPU driver from the manufacturer’s support page, as outdated or corrupted drivers frequently cause the Sandbox virtual display to fail.

If the issue still appears, please try running sfc /scannow and DISM /online /cleanup-image /restorehealth from an elevated command prompt to repair possible system file corruption. You can also test disabling virtual GPU (vGPU) for Sandbox by opening Group Policy Editor and navigating to Computer Configuration → Administrative Templates → Windows Components → Windows Sandbox and setting “Allow vGPU” to Disabled, then rebooting. Additionally, ensure that no third party antivirus or virtualization software such as VMware or VirtualBox is conflicting with Hyper-V.

If none of the above resolves the black screen, you may also try fully resetting the Sandbox environment by deleting the folder located at: C:\Users\<YourUserName>\AppData\Local\Packages\Microsoft.WindowsSandbox_*.

Windows will recreate it automatically at the next launch.

If this guidance proves helpful, feel free to click “Accept Answer” so we know we’re heading in the right direction and let me know if you need any assistance. Thank you