Lenovo ThinkPad W520 4284 Hardware Maintenance Manual

Also see for THINKPAD T520: Deployment guide Deployment guide Guía de despliegue Guide de déploiement Guida alla distribuzione

Contents

Also, in either of the following events, the computer automatically returns from sleep (standby) mode andresumes operation:• The ring indicator (RI) is signaled by a serial device or a PC Card device. ( does not support the ringindicator (RI) resume by PC Card device.)• The time set on the resume timer elapses.Note: The computer does not accept any input immediately after it enters sleep (standby) mode. Wait afew seconds before taking any action to reenter operation mode.Hibernation modeIn hibernation mode, the following occurs:• The system status, RAM, VRAM, and setup data are stored on the hard disk.• The system is powered off.Note: If the computer enters the hibernation mode while it is docked to the docking station, do not undock itbefore resuming normal operation. If you do undock it and then try to resume normal operation, you will getan error message, and you will have to restart the system.To cause the computer to enter hibernation mode, do any of the following:• Press the Fn+F12 keys.• If you have defined one of the following actions as the event that causes the system to go into hibernationmode, 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:• If a “hibernation time” has been set on the timer, and if the user does not do any operation with thekeyboard, the TrackPoint, the hard disk drive, the parallel connector, or the diskette drive within that time.• If the timer conditions are satisfied in suspend mode.When the power is turned on, the computer returns from hibernation mode and resumes operation. Thehibernation file in the boot record on the hard disk drive is read, and system status is restored from thehard disk drive.Symptom-to-FRU indexThis section contains following information:• Numeric error codes• Error messages• Beep symptoms• No-beep symptoms• LCD-related symptoms• Intermittent problems• Undetermined problemsThe symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The mostlikely cause is listed first, in boldface type.Chapter 4. Related service information 39