Windows Vista and Windows 7 Black Screen on Computer Unlock

Reason for Problem:

1.   A Windows Vista or Windows 7 computer is running the “Aero” graphics mode.

2.  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.

3.  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”.

4.  A person unlocks the computer by entering their user credentials.

Solution:

1.disable  “Desktop Window Manager Session Manager” service

• a. 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.

• b. Locate and then double-click the Desktop Window Manager Session Manager service.

• c. Locate the “Startup type” dropdown and change the value to “disabled”.

• d. Locate and click the button labeled “Stop”.

• e. Click the Apply button, and then click the OK button

2. update computer display dirver for windows 7.