Using The Power Saving Mode - Sony Vajo VGC-LT20 Series User Manual

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Customizing Your VAIO Computer
Using the Power Saving Mode
In addition to the normal operating mode, which allows you to turn off specific devices, your computer has a distinct power
saving mode called Sleep mode.
Using Normal Mode
This is the normal state of the computer when it is in use. The green power indicator light is on in this mode. To save power
while not working, you can turn off a specific device such as the LCD screen or the hard disk drive.