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
1Close all open programs.
2Click Start, the arrow next to the Lock button, and Restart.
3If your computer does not restart, press the Ctrl+Alt+Delete keys and click the arrow next to the Shut down button and Restart.
4If 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.