Sony VGN-FS920 - Manual (Page 72)

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Customizing Your VAIO Computer
5 Select Password when Power ON under Security.
Press the space bar to change the setting from Disabled to Enabled.
6 Use the < or , key to select Exit and select Exit (Save Changes); and then press the Enter key.
On the Setup Confirmation screen, make sure that Yes is selected and then press the Enter key.