Sony VGC-RM1 - Manual (Page 127)

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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 mode.
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.