HP Compaq NC6110 Software Manual page 9

In the Power Options window, Hibernation is not displayed as an
option if it has been disabled. Enable Hibernation in order to
select it in the Power Options window. To verify that Hibernation
is enabled:
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In Microsoft Windows 2000, select Start > Settings >
Control Panel > Power options icon > Hibernate tab. Make
sure that the Enable Hibernate Support check box is selected.
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In Windows XP, select Start > Control Panel > Power
Options icon > Hibernate tab. If Hibernation is enabled, the
Enable Hibernation check box is selected.
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CAUTION: If the configuration of the notebook is changed during
Hibernation, resuming from Hibernation may not be possible.
When the notebook is in Hibernation:
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Do not dock or undock the notebook in a Port Replicator.
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Do not add or remove memory modules.
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Do not insert or remove the hard drive.
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Do not connect or disconnect external devices.
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Do not insert or remove a PC Card or a Secure Digital (SD) card.
Software Guide
Power
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