Connecting An External Display - Sony VGN-U750P VAIO Read This First Manual

Connecting an external display

You can connect an external display to your computer via the port replicator or the display/LAN adapter. For example, you can use
your computer with a computer display or a projector.
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Turn off your computer and the peripherals, unplug the AC adapter and the power
cord before connecting the external display.
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Connect the power cord after connecting all other cables.
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Turn on the peripherals, then turn on your computer.
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Connected external displays are used as second screens.
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(For Windows systems only) You can also use an external display to set up
multiple monitors.
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Connecting peripheral devices