IBM ThinkPad G40 Hardware Maintenance Manual page 38

Related service information
To cause the computer to enter hibernation mode, do any
of the following:
v Press the Fn+F12 keys.
v If you are using the ACPI operating system and have
defined one of the following actions as the event that
causes the system to go into hibernation mode, perform
that action.
– Closing the lid.
– Pressing the power button.
– Pressing Fn+F4 keys.
Also, the computer goes into hibernation mode
automatically in either of the following conditions:
v If a "hibernation time" has been set on the timer, and
the user does not do any operation with the
keyboard, the TrackPoint, the hard disk drive, the
parallel connector, or the diskette drive within that
time.
v If the timer conditions are satisfied in suspend mode.
When the power is turned on, the computer returns from
hibernation mode and resumes operation. The
hibernation file in the boot record on the hard disk drive
is read, and system status is restored from the hard disk
drive.
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ThinkPad G40