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Windows 7: Blank Screen After Unlocking (Please Help)

06 Jan 2011   #1

Windows 7 Professional 32bit
Blank Screen After Unlocking (Please Help)

Hey Everyone!!

Have there been any further solutions or possible remedies for this problem? I have tried all of the solutions listed below and nothing has solved this issue.

I can tell you that the 3 computers that are still having this problem are all Dell E6510 laptops. Core i5, 4GB 1333, NVidia 3100m 512MB, using Windows 7 Professional 32-bit. They are all also using port replicators/docking stations and secondary monitors, Dell 1910 19" flat screens.

I have 3 other set-ups at the moment using the same software and hardware with one exception. They all use either the Matrox DualHead2Go or TripleHead2Go analog adapters and run multiple monitors. None of these systems are having problems after stopping the Desktop manager.

This is the "resolution" from Microsoft at the moment, but I am still having the same problems. Any help would be greatly appreciated.


Consider the following scenario:

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.

After the credential are entered the screen goes black, and remains black for as much as 10 minutes or longer. The machine is not “hard-locked”, as periodic disk-drive activity may be noted from the disk-drive indicator light on the computer, if so equipped.

A problem with some layer of security software causes the Desktop Window Manager to wait for an unspecified amount of time.

Possible Solutions:

1. A temporary workaround is to Stop and Disable the “Desktop Window Manager Session Manager” service. 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. To disable this 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. Updated display drivers may resolve this issue. You can determine the manufacturer of the display adapter by following these steps:

3. The final solution is to discover what layer of security software is causing the temporary blocking which renders the screen black and therefore unusable. That layer of software would need to be uninstalled or updated to prevent the blocking condition in the Desktop Window Manager.

One symptom that has been noted if this condition is true is that the DWM, or Desktop Window Manager process will consume an ever increasing amount of memory, as displayed in Task Manager.

My System SpecsSystem Spec


 Blank Screen After Unlocking (Please Help)

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