Sony VGN-BX740 - Manual (Page 214)

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Troubleshooting
Why does an error message appear when I press the UNDOCK button or select Undock
Computer from the Start menu?
When any device inserted or connected to the multi function bay docking station is in use, you cannot disconnect your
computer form the docking station. Save unsaved data, exit applications using such devices, and then try again.
If the above does not work, shut down your computer and disconnect it from the multi function bay docking station.