Sony VAIO VGN-Z500 Series - Manual (Page 95)

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Using Peripheral Devices
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For selecting a video controller, see Selecting Performance Modes (page 109) .
You may not be able to display the same contents on your computer screen and the external display or projector at the same time, depending on the
type of your external display or projector.
Before turning on your computer, turn on the external display.