Sony VGN-SZ300 - Manual (Page 85)

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Using Peripheral Devices
Alternatively, you can disconnect the computer from the docking station as follows:
1 Click Start and then Undock Computer.
2 Make sure that a message balloon appears and the IN USE indicator turns off; and then lift the computer away from the
docking station.
3 Close the docking station connector cover on the bottom of the computer.
✍
It is extremely important to close the docking station connector cover after disconnecting your computer from the docking station. If the cover is left
open, dust may get inside and damage the computer.
To disconnect the docking station completely from AC power, unplug the AC adapter.