Troubleshooting Power Management; The Power Management Setting Is Not Responding - Sony PCG-K415B User Manual

To return to Normal mode, proceed as follows:
Turn on the computer by pressing the power button.
The computer returns to its previous state.
If you press the power button for more than four seconds, the computer will switch off automatically.
If you do not use the AC adapter for a long period of time, put your computer into Hibernate mode. This power saving mode saves you the time of shutting down
in the normal way.
When the computer is in Hibernate mode, you cannot insert a disc.
Hibernate mode requires more time than Standby mode to be activated.
It takes more time to return to Normal mode from Hibernate mode than from Standby mode.
Hibernate mode uses less power than Standby mode.
Do not move the computer until its power indicator turns off.

Troubleshooting power management

The power management setting is not responding

Your 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, proceed as follows:
1 Close all open applications.
2 Press <Ctrl>+<Alt>+<Delete> simultaneously and select Restart from the shut down menu drop-down list.
The computer restarts.
3 If the procedure does not work, press and hold the power button for four seconds or longer to shut down the computer.
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Using your VAIO computer