Sony PCG-GRX670K Manual

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Disconnecting a mouse or keyboard 
You can disconnect a USB mouse or keyboard when the computer is 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 
Unplug the USB cable from the USB port 
on the computer. 
Unplug the PS/2 cable from the Mouse/Keyboard (PS/2) port 
on the port replicator. 
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