To The Computer - Sony VGN-BX740 User Guide (Microsoft® Windows Vista™) User Manual

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Troubleshooting
Why doesn't my screen turn off when the time selected for the automatic turn-off action
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 the screen saver other than the VAIO Original Screen Saver.
What should I do if I cannot boot my computer from the USB floppy disk drive connected

to the computer?

To boot your computer from the USB floppy disk drive, you need to change the boot device.
Turn on your computer and press the F11 key when the VAIO logo appears.