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After you configure the energy-saving settings for a liquid crystal display (LCD) monitor by using the following steps, some portable computers that are running Windows XP SP1 may enter a state where the monitor does not turn on again, even though you press a key on the keyboard.
In Control Panel, double-click Power Options. The Power Options Properties dialog box appears.
Under Plugged in, set Turn off monitor to After 1 min.
Wait for the monitor to turn off after 1 minute.
Close the lid of the portable computer.
Disconnect the computer from the power source.
Open the lid of the portable computer.
The monitor may not come on, even after you press a key on the keyboard.
This error results from a process timing issue for the LCD Power revert in Windows XP SP1.
To resolve this issue, create the following registry key:
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.