Troubleshooting Power Management - Sony PCG-K215B Hardware Manual

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 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