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In Windows Vista, the Turn off the display setting in the Power Options item in Control Panel may change unexpectedly when you configure the Put the computer to sleep setting. For example, the Turn off the display setting is changed to 5 hours when you set the Put the computer to sleep setting to Never.
This behavior occurs if you configure the Put the computer to sleep setting to use a value that is equal to or shorter than the value that you specified in the Turn off the display setting
To work around this behavior, set the Turn off the display setting to the value that you want, and then click Save Changes.
This behavior is by design.
In Windows Vista, the Turn off the display setting is automatically set to the next shortest value when you configure the Put the computer to sleep setting.