Sony VGN-UX490N - Manual (Page 73)

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Using Peripheral Devices
Disconnecting Your Computer from the Port Replicator
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To prevent loss of unsaved data, be sure to turn off your computer before disconnecting it from the port replicator.
To disconnect your computer from the port replicator
1 Turn off the computer and the connected peripherals.
2 Slide the computer up along the guide holder and away from the port replicator.
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To disconnect the port replicator completely from AC power, unplug the AC adapter.