Sony VGN-S570P - Manual (Page 65)

65 n N
Using Peripheral Devices
4 Close the port replicator connector cover on the bottom of the computer.
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It is extremely important to close the port replicator connector cover after disconnecting the computer from the port replicator. If the cover is left open,
dust may get inside and damage the computer.
To disconnect the port replicator completely from AC power, unplug the AC adapter.