Sony VGN-TT250N - Manual (Page 181)

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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/i.LINK optical disc drive,
you need to change the boot device.
Turn on your computer and press the F11 key when the VAIO logo appears.