Sony VAIO VPCF12 Series - Manual (Page 125)

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Troubleshooting >
Computer Operations
What should I do if the green power indicator light turns on but my screen remains blank?
❑ Make sure the LCD backlight of your computer is turned on. To turn on the LCD backlight, see Using Special-function
Buttons (page 38) .
❑ Press the Alt+F4 keys several times to close the application window. An application error may have occurred.
❑ If the Alt+F4 keys do not work, click Start, the arrow next to the Shut down button, and Restart to restart your computer.
❑ If your computer does not restart, press the Ctrl+Alt+Delete keys and click the arrow next to the Shut down
button and Restart.
If the Windows Security window appears, click Restart.
❑ If this procedure does not work, press and hold the power button for more than four seconds to shut down your computer.
Unplug the AC adapter and leave the computer for about five minutes. Then plug the AC adapter and turn on the computer
again.
!
Turning off your computer with the Ctrl+Alt+Delete keys or the power button may cause loss of unsaved data.