To return the settings for the Desktop Window Manager Session Manager service to normal via the CMD line: sc config UxSms start= auto Click the Apply button, and then click the OK button.Īlternatively, you can run the following commands from an elevated CMD prompt to set the service properties of the Desktop Window Manager Session Manager service to not running and disabled: net stop UxSms.Locate and click the button labeled 'Stop'.Locate the Startup type dropdown and change the value to 'disabled'.Locate and then double-click the Desktop Window Manager Session Manager service.Click the Start button, type services.msc and then press the ENTER key, or click the icon that comes up under Programs in the Instant Search box.Disabling this service will turn off the 'Aero' graphics display feature, which will disable certain features such as Aero Peek, Aero Snap, Aero Shake, and so on. ResolutionĪ temporary workaround is to Stop and Disable the 'Desktop Window Manager Session Manager' service. CauseĪ problem with some layer of security software causes the Desktop Window Manager to wait for an unspecified amount of time. The machine isn't 'hard-locked', as periodic disk-drive activity may be noted from the disk-drive indicator light on the computer, if so equipped. A person unlocks the computer by entering their user credentials.Īfter the credential is entered, the screen goes black, and remains black for as much as 10 minutes or longer.The computer is locked and left undisturbed long enough for the screen to go black, which is 20 minutes with the default power policy of 'Balanced'.The Windows Vista or Windows 7 computer is subject to additional security restrictions and security software, such as might be the case in the enterprise, or with mandated security settings and software such as DISA or DoD requirements.A Windows Vista or Windows 7 computer is running the 'Aero' graphics mode.This article provides a solution to an issue where Windows black screen when unlocking a computer.Īpplies to: Windows 7 Service Pack 1 Original KB number: 2431700 Symptoms

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