Microsoft Confirms Windows 11 Updates Cause Black Screens After Sign-In on Some Devices

Microsoft has confirmed that recent Windows 11 updates can leave some devices on a black screen after sign-in, with the desktop session failing to load, according to a new entry on the Windows release health dashboard. The issue affects Windows 11 versions 24H2, 25H2, and 26H1, and Microsoft has marked it as mitigated while a permanent fix is in development. The problem started with the August 2026 non-security preview update, KB5120998, and carries over into subsequent updates.