Power ManagementChapter 2 Operating on Battery Power 41To leave Standby mode and return to normal mode:q Press any keyq Move the active pointing device (internal or external, PS/2 or serial)q Have the resume timer set and let it be matchedq Open the display coverq An incoming PC card modem event occursHibernation ModeIn Hibernation mode, all power shuts off (the computer doesnot consume any power). The computer saves all systeminformation onto the hard disk before it enters Hibernationmode. Once you turn on the power, the computer restoresthis information and resumes where you left off uponleaving Hibernation mode.There is one necessary conditions for the computer to enterHibernation mode:q The Hibernation file created by PhDISK must be presentand valid. See “PhDISK” on page 73.In this situation, there are four ways to enter Hibernationmode:q Pressing the Hibernation hot key Fn-F4q If the waiting time specified by the S2D Timeout valueelapses without any system activityq If a battery low condition occurs and the Battery LowSuspend parameter in Setup is set to [ENABLED].q Invoked by the operating system power saving modesNote: If the computer beeps but does not enterHibernation mode after pressing the Hibernation hot key,it means the operating system will not allow the computerto enter the power-saving mode.