Sony VAIO VGN-C270CNH, User Manual

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Troubleshooting
What should I do if my computer or software stops responding?
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If your computer stops responding while a software application is running, press the Alt+F4 keys to close the application
window.
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If the Alt+F4 keys do not work, click Start, the arrow next to the Lock button, and Shut Down to turn off your computer.
❑
If your computer does not turn off, press the Ctrl+Alt+Delete keys and click the arrow next to the Shut down button
and Shut Down.
If the Windows Security window appears, click Shut Down.
!
Turning off your computer with the Ctrl+Alt+Delete keys or the power button may cause loss of unsaved data.
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If your computer still does not turn off, press and hold the power button until the computer turns off.
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Remove the AC adapter and battery pack.
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Try reinstalling the software.
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Contact the software publisher or designated provider for technical support.