The monitor may not turn off on a Windows XP-based computer even though you set the monitor to turn off after a period of inactivity

Consider the follow scenario:

• On a Windows XP-based computer, you set the monitor to turn off after a period of inactivity.
• You set the power button on the computer to the "Shut down" setting in Control Panel.
• You press the power button.
• The system shutdown behavior is stopped because of an application that the system cannot close.

In this scenario, the monitor does not turn off after the specified period.

This problem occurs because, when the system shutdown behavior is stopped by because of application that does not close, system power requests are canceled. This occurs because the application returns a BROADCAST_QUERY_DENY message in response to the WM_POWERBROADCAST message and the PBT_APMQUERYSUSPEND message. Therefore, the system power state data contains information from the canceled request. In this case, if the system tries to turn off the monitor by using the system timer, the system cannot turn off the monitor.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must have Windows XP Service Pack 2 or a later service pack installed on the computer. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows XP with Service Pack 2, x86-based versions

Windows XP with Service Pack 3, x86-based versions

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about the WM_POWERBROADCAST message, visit the following Web site: