Sony Vaio Series Benutzerhandbuch

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Check that the computer is plugged into a power source and that it is turned 
on. Check that the power light is lit on the front panel of the computer.

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Confirm that a disk is not in the floppy disk drive (unless you are using a 
bootable floppy disk).

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Confirm that a CD is not in an optical drive (unless you are using a bootable 
CD).

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Confirm that the power cord and all cables are connected firmly.

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If you plugged the computer into a power strip or Uninterruptible Power 
Supply (UPS), make sure the power strip or UPS is turned on and working.

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Check that the monitor is plugged into a power source and turned on. Check 
that the brightness and contrast controls are adjusted correctly. See the 
manual that came with your display for details.

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Check that the computer is not in stand by mode.

You can try to locate and close the software application that has stopped 
responding.

Press the Ctrl+Alt+Delete keys. The Windows® Task Manager window 
appears.

From the Applications tab, locate the application that has the status message, 
“Not responding.”

Select the application that has a Not Responding status and click End Task. 
Windows attempts to close the application.

If your computer does not respond or the application does not close, try the 
following steps:

Save any open files, if possible.

Press the Alt+F4 keys. The Turn Off Computer window appears.

Click Restart.