Sony VAIO VGN-A700 - Manual (Page 181)

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Troubleshooting
Why doesn't my computer enter Hibernate mode?
You may first need to enable Hibernate mode. Follow these steps:
1 Click Start and then Control Panel.
2 Click Performance and Maintenance.
3 Click Power Options.
The Power Options Properties window appears.
4 Select the Hibernate tab.
5 Click to check the box next to Enable hibernation.