Sony PCG-GRX580P - Manual (Page 139)

My notebook stops responding or does not shut down.
It is best to shut down your notebook using the Shut Down command on the Windows Start menu. Using other methods,
including those listed here, may result in loss of unsaved data.
 Try restarting the notebook. On the Windows taskbar, click Start, select Turn Off Computer, and then click Turn Off.
 If you cannot restart as described in the preceding step, you can restart the notebook by pressing the
Ctrl+Alt+Delete keys simultaneously and then clicking Turn Off on the Windows Security screen.
 If the previous step does not work, press and hold the power button for at least four seconds. This turns off the
power.
 If your notebook stops responding while playing a CD or DVD, stop the CD/DVD, restart the notebook by pressing
the Ctrl+Alt+Delete keys simultaneously, and then clicking Turn Off on the Windows Security screen.
 Unplug the notebook from the AC adapter and remove the battery pack from your notebook.
Note:
Pressing the Ctrl+Alt+Delete keys simultaneously or turning off the notebook with the power switch may result in data loss
in files that are currently open.
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