Sony VGN-U750P VAIO Read This First Manual page 18

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The following information helps you configure your computer to prompt for a password entry when you turn on your computer
or display the BIOS setup screen.
5 Select Password When Power ON under Security.
Press the space bar to change the setting from Disabled to Enabled.
6 Use or to select Exit and then Exit (Save Changes); and press Enter.
On the Setup Confirmation screen, confirm that Yes is selected and then press Enter.
Changing/removing the password
To change or remove the password, proceed as follows:
1 Turn on your computer.
2 Press F2 when the VAIO logo appears.
The BIOS setup screen appears. If not, press F2 several times.
3 Enter the current password for Enter Password:
4 Use or to select Security to display another screen, select Set Machine Password, and then press Enter.
5 On the password entry screen, enter the current password once and then a new password twice; and press Enter.
To remove the password, leave Enter New Password and Confirm New Password blank and press Enter.
6 Use or to select Exit and then Exit (Save Changes); and press Enter.
On the Setup Confirmation screen, confirm that Yes is selected and then press Enter.
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Using your VAIO computer