Update Drivers for Standby and Hibernation
Published: September 10, 2001
If your computer won't enter standby or hibernation, it may require updated drivers. Power management features, especially standby and hibernation, rely on device drivers that support power management in addition to compatible hardware. Incompatible video drivers prevent these features from working. The built-in VGA driver, for example, is a bare-bones driver that doesn't support power management.
If standby and hibernate don't work, install an updated driver for your display adapter.
Tip taken from Microsoft Windows XP Inside Out by Ed Bott and Carl Siechert. Published by Microsoft Press.