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Although hibernation is most commonly used with laptop computers, it's also available in desktop PCs. To modify the hibernation settings in Windows 7, you do need to be signed into an account that has administrator privileges, but the process itself really isn't that bad at all. We'll first look at how to turn hibernation on and off through a command prompt.
As an additional reference, you may also want to take a look at Comparing Sleep and Hibernation in Windows 7.
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Using the Command Prompt
Step 1: Click on the Start button and enter cmd in the search box. See the screenshot to the left – click the image for a larger view.
Step 2: In the list of programs that appears after searching, right-click on cmd and select Run as administrator. This will bring up the window shown to the right.
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In this case, it is very likely that the hybrid sleep settings in Windows 7 are preventing the Hibernate option from appearing. This can be corrected by turning off hybrid sleep. For more information on how to do this, see How to Change Sleep State Settings in Windows 7.
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Changing Hibernation Time Settings
Once hibernation is enabled, you can set the length of idle time you want to pass before Windows 7 goes into hibernation. To do this, perform the following steps.
Step 1: Open the Control Panel, select to view the options by Large icons or Small icons. Then, click on Power Options.
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Step 6: When done, click Apply and then OK to return to the Control Panel. Click on the Save Changes button unless it has been grayed out. Then, close out the Control Panel.