Sony VGN-FS980 - Manual (Page 73)

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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 Press the < or , key to select Exit, select Exit (Save Changes) or Exit Setup, and then press the Enter key.
On the Setup Confirmation screen, make sure that Yes is selected and then press the Enter key.