Sony VGC-LS20 - Manual (Page 123)

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Troubleshooting
Why doesn't my computer enter Sleep mode?
Your computer may become unstable if the operating mode is changed before the computer completely enters Sleep.
To restore your computer to normal operating stability
1 Close all open programs.
2 Click Start, the arrow next to the Lock button, and Restart.
3 If your computer does not restart, press the Ctrl+Alt+Delete keys and click the arrow next to the Shut down button and
Restart.
4 If this procedure does not work, press and hold the power button until the computer turns off.
!
Turning off your computer with the power button may cause loss of unsaved data.
What should I do if Windows does not start, showing a message, when I start my
computer?
If you enter a wrong power-on password three times consecutively, the Enter Onetime Password message appears and
Windows will not start. Press and hold the power button for more than four seconds to check that the power indicator goes
off. Wait for 10 or 15 seconds, then restart your computer and enter the correct password. When entering the password,
check that the Num lock indicator and Caps lock indicator on the wireless keyboard are off. If any are lit, press the Num Lk
key or the Caps Lock key to turn off the indicator before entering the password.