Sony PCG-F640 Manual

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If you connected an external mouse while your notebook is on, you must 
restart your notebook.

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If you are using an optional Sony USB mouse PCGA-UMS1, check that the 
mouse is plugged into the USB connector.

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You may have disabled the touchpad without a mouse being connected to the 
notebook. You must restart the notebook to make the touchpad work again.

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If your touchpad is interpreting a single tap as a double-click, you must 
adjust the button assignments. Follow these steps:

1

Click Start, point to Control Panel, and then click on the Mouse icon.

2

Change the button assignments in the Mouse Properties dialog box. 
(One of the buttons is assigned to the double-click action.) 

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Click the Start button on the Windows taskbar, and select Shut Down to 
display the Shut Down Windows dialog box, then press Enter.

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If you cannot turn off your notebook as described in the step above, press 
Ctrl+Alt+Delete to restart the notebook.

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If you cannot restart your notebook as described in the step above, press and 
hold the power button for more than four seconds to turn off the notebook.

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If the pointer does not move while playing a disc, press Ctrl+Alt+Delete to 
stop playback and restart the notebook.

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The device has not been recognized. Put the notebook into System Idle mode 
by pressing the Fn and S keys and then resume.

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If the device is still not recognized or does not appear in the My Computer 
window, remove and reinsert it.