45Battery-low parameter in the BIOS Utility is enabledq When the advanced power button function(s) in theNotebook Manager program is/are set to Hibernation modeq Invoked by the operating system power-saving modesNote: If the computer beeps but does not enter Hibernation mode afterpressing the Hibernation hot key, it means the operating system will not allowthe computer to enter the power-saving mode.To exit Hibernation mode, press the power switch. Thecomputer also resumes from Hibernation mode if the resumetimer is set and matched.Warning! Do not change any devices (such as add memory or swap harddisks) when the computer is in Hibernation mode.Sleep Mode (ACPI)If ACPI is installed, all power management functions are handledby the Windows operating system. In this set-up, you do notneed to set timeout values for devices before they enter a powersaving mode. For more information on ACPI, see “AdvancedConfiguration and Power Interface” on page 46.Sleep mode may be one of three computer power saving modes:standby, hibernation or power off. Windows automaticallydetermines which of these modes to enter in.To enter Sleep mode under ACPI:q Press the Sleep hot key Fn-F4.q Idle times for devices and the computer determined byWindows 98 elapsesExiting sleep mode depends on which power saving mode thecomputer is currently in.