Sony PCG-FXA63 Manual

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Disconnecting a mouse or keyboard 
You can disconnect a USB mouse or keyboard when the computer is turned on or off. Disconnecting the USB mouse or
keyboard when the computer is in a power saving mode (Standby or Hibernate) may cause the computer to malfunction. 
To disconnect the USB mouse or keyboard when the computer is off 
  Unplug the USB cable from the USB port 
on the computer. 
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