Sony VAIO VGN-P500 - Manual (Page 128)

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Troubleshooting
Why doesn't my screen turn off after the automatic turn-off time has passed?
The VAIO original screen saver disables the timer setting, which you can select using the Windows power options, for your
screen to turn off.
Select a screen saver other than the VAIO original screen saver.
What should I do if I cannot boot my computer from the external device connected to the
computer?
To boot your computer from the external device, for example the USB floppy disk drive and the USB optical disc drive, you
need to change the boot device.
Turn on your computer and press the F11 key when the VAIO logo appears.