xp
To automatically put your computer into hibernation
You must be logged on to your computer with an owner account in order to complete this procedure.
1. Open Power Options in Control Panel. (Click Start, click Control Panel, and then double-click Power Options.)
2. Click the Hibernate tab, select the Enable hibernate support check box, and then click Apply.
If the Hibernate tab is unavailable, your computer does not support this feature.
vista
Go to the command prompt icon in the Start menu under Accessories and right click the icon: click "Run as administrator".
Paste: "powercfg.exe /hibernate on" and hit Enter and also paste "powercfg -h on" and hit enter just to be safe.
Open Control Panel and type in "Hibernate" in the Search.
Click "Turn hibernation on or off"
Click "Change advance power settings"
Scroll to and expand the "Sleep" option.
Select "Off" to the "Allow hybrid sleep" option.
Scroll to and expand the "Power buttons and lid" option.
Select "Hibernate" for the "Sleep button action" option. 10. Select "Hibernate" for the "Start menu power button" option.
windows 7
Click the Start button, and then click the arrow next to the Shut down button.
Sleep and Hibernate located on the menu
If sleep or hibernate aren't available, it might be for one or more of the following reasons:
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