Why doesn't the computer screen rotate?
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The screen rotation may be disabled.
Open the charms and select the
Settings charm, and then check the display settings.To open the charms, see Opening the Charms.
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The screen rotation is disabled while your VAIO computer is connected to an external display.
If you connect the computer to an external display while using the computer in portrait orientation, the computer screen automatically changes to landscape (horizontal) orientation.
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With the LCD screen raised and the keyboard available, the screen rotation is not available.