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To put your computer into sleep mode, open the Start menu, click
In certain circumstances, the computer goes into sleep mode automatically:
• After a period of inactivity specified in power plan settings
• When the battery power is low
To resume the computer from sleep mode, press the power button.
Also, in either of the following events, the computer automatically returns from sleep mode and resumes
operation:
• The ring indicator (RI) is signaled by a serial device or a PC Card device.
• The time set on the resume timer elapses.
Note: The computer does not accept any input immediately after it enters sleep mode. Wait a few
seconds before taking any action to reenter operation mode.
Hibernation mode
In hibernation mode, the following occurs:
• The system status, RAM, VRAM, and setup data are stored on the hard disk drive, hybrid drive, or solid-
state drive.
• The system is powered off.
Note: If the computer enters the hibernation mode while it is docked to the docking station or the port
replicator, do not undock it before resuming normal operation. If you do undock it and then try to resume
normal operation, you will get an error message, and you will have to restart the system.
If you have defined one of the following actions as the event that causes the system to go into hibernation
mode, perform that action.
• Closing the lid.
• Pressing the power button.
Also, the computer goes into hibernation mode automatically after a period of inactivity specified in power
plan settings.
When the power is turned on, the computer returns from hibernation mode and resumes operation. The
hibernation file in the boot record on the hard disk drive, hybrid drive, or solid-state drive is read, and system
status is restored from the hard disk drive, hybrid drive, or solid-state drive.
Symptom-to-FRU index
This section contains following information:
• "Numeric error codes" on page 34
• "Error messages" on page 35
• "Beep symptoms" on page 36
• "No-beep symptoms" on page 37
• "LCD-related symptoms" on page 37
• "Intermittent problems" on page 38
• "Undetermined problems" on page 38
The symptom-to-FRU index in this section lists symptoms and errors and their possible causes. The most
likely cause is listed first, in boldface type.
Power, and then click Sleep
.
Chapter 4
Related service information
33
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