Sony PCG-R505ECP Online Help Center (VAIO User Guide) User Manual page 30

Notes on power saving modes

When returning from Hibernate mode, the system status stored on the hard disk is erased and the computer starts
normally if you press the power button and hold it for more than four (4) seconds.

Standby uses more power than Hibernate.

Standby requires less time than Hibernate to return to normal mode.
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