Sony PCG-R505ELP VAIO User Guide (primary manual) User Manual page 110

My computer is unstable.
Your computer's operating system may become unstable if a lower power state, such as Hibernate, is initiated then
changed before the computer completely enters the lower power state.
To restore the computer to its normal operating stability:
1. Close all open applications.
2. Restart the computer by pressing the Ctrl+Alt+Delete keys simultaneously and clicking Restart on the Windows
Security window.
3. If this procedure does not work, press and hold the power button for four seconds or longer to shut down the
computer.
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