Sony S User Manual

Troubleshooting Power Management

The power management setting is not responding

The computer's operating system may become unstable if a lower power state, such as Hibernate is initiated, and then 
changed before the computer completely enters the lower power state.

To restore the computer to its normal operating stability

Close all open applications.

Press the Ctrl+Alt+Delete keys simultaneously and select Restart from the shut down menu drop-down list.
The computer restarts.

If the procedure does not work, press and hold the power button for four seconds or longer to shut down the computer.