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Document Part Number: 393525-002
December 2005
This guide explains how the computer uses power.


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  • Page 1

    Power Document Part Number: 393525-002 December 2005 This guide explains how the computer uses power.

  • Page 2: Table Of Contents

    Contents 1 Power controls and lights 2 Power sources Connecting the AC adapter ..... . . 2–2 3 Standby and hibernation Standby.

  • Page 3

    Contents 6 Processor performance controls 7 Battery packs Inserting or removing a battery pack ....7–2 Charging a battery pack ......7–4 Monitoring the battery pack charge .

  • Page 4: Power Controls And Lights

    Power controls and lights The following illustration and table identify and describe the power control and light locations. Component Description Display switch Initiates standby if the display is closed when the computer is on. Power lights* (2) On: The computer is on. Blinking: The computer is in standby.

  • Page 5

    Power controls and lights Component Description Power button When the computer is ■ Off, press to turn on the computer. ■ On, press to enter hibernation. ■ In standby, briefly press to exit standby. ■ In hibernation, briefly press to exit hibernation.

  • Page 6: Power Sources

    Power sources The computer can run on internal or external AC power. The following table indicates the best power source for common tasks. Task Recommended Power Source ■ Charged battery pack in the computer Work in most software applications ■ External power supplied through one of the following devices: ❐...

  • Page 7: Connecting The Ac Adapter

    Power sources Connecting the AC adapter Å WARNING: To reduce the risk of electric shock or damage to the equipment: ■ Plug the power cord into an AC outlet that is easily accessible at all times. ■ Disconnect power from the computer by unplugging the power cord from the AC outlet (not by unplugging the power cord from the computer.) ■...

  • Page 8: Standby And Hibernation

    Standby and hibernation Standby and hibernation are energy-saving features that conserve power and reduce startup time. They can be initiated by you or by the system. For more information, refer to “Initiating standby, hibernation or shutdown.” Standby Ä CAUTION: To avoid a complete battery discharge, do not leave the computer in standby for extended periods.

  • Page 9: Hibernation

    Standby and hibernation Hibernation Ä CAUTION: If the configuration of the computer is changed during hibernation, resuming from hibernation may not be possible. When the computer is in hibernation: ■ Do not dock the computer in or undock the computer from a docking device.

  • Page 10: Initiating Standby, Hibernation Or Shutdown

    Standby and hibernation Initiating standby, hibernation or shutdown The following sections explain when to initiate standby or hibernation and when to shut down the computer. ✎ You cannot initiate any type of networking communications or perform any computer functions when the computer is in standby or hibernation.

  • Page 11: When A Reliable Power Supply Is Unavailable

    Standby and hibernation When a reliable power supply is unavailable Make sure that hibernation remains enabled, especially if you are operating the computer on battery power and do not have access to an external power supply. If the battery pack fails, hibernation saves your work to a hibernation file and shuts down the computer.

  • Page 12: When Using Wireless Communication Or Readable Or Writable Media (select Models Only)

    Standby and hibernation When using wireless communication or readable or writable media (select models only) Ä CAUTION: To prevent possible audio and video degradation, or loss of audio or video playback functionality, do not initiate standby or hibernation when reading or writing to a CD, DVD, or external media card.

  • Page 13

    Standby and hibernation 3–6 Power...

  • Page 14: Default Power Settings

    Default power settings This section explains the default standby, hibernation, and shutdown procedures. The controls and lights discussed in this section are illustrated in Chapter 1, “Power controls and lights.” Power 4–1...

  • Page 15: Turning The Computer Or Display On Or Off

    Default power settings Turning the computer or display on or off Task Procedure Result ■ The power lights are Turn on the Press the power button. computer. turned on. ■ The operating system loads. ■ The power lights are Shut down the Save your work and close all computer.

  • Page 16: Using Emergency Shutdown Procedures

    Default power settings Using emergency shutdown procedures Ä CAUTION: Emergency shutdown procedures result in the loss of unsaved information. If the computer is unresponsive and you are unable to use normal Windows shutdown procedures, try the following emergency procedures in the sequence provided: ■...

  • Page 17: Initiating Or Resuming From Standby

    Default power settings Initiating or resuming from standby Task Procedure Result ■ With the computer on, ■ The power lights Initiate standby. press fn+f5. blink. ■ The screen clears. – or – ■ Select Start > Turn Off Computer > Stand by. In Windows XP Professional, if Stand by is not displayed.

  • Page 18: Initiating Or Restoring From Hibernation

    Default power settings Initiating or restoring from hibernation Hibernation cannot be initiated unless it is enabled. Hibernation is enabled by default. To verify that hibernation remains enabled: » Select Start > Control Panel > Performance and Maintenance > Power Options > Hibernate tab. If hibernation is enabled, the Enable hibernation check box is selected.

  • Page 19

    Default power settings Task Procedure Result ■ The power lights are Allow the system No action required. If the to initiate computer is running on battery turned off. hibernation (with power, the system initiates ■ The screen clears. hibernation hibernation enabled).

  • Page 20: Power Options

    Power options You can change many default power settings in Windows Control Panel. For example, you can set an audio alert to warn you when the battery pack reaches a low-power condition, or you can change the default settings for the power button. By default, when the computer is on: ■...

  • Page 21: Displaying The Power Meter Icon

    Power options Displaying the Power Meter icon By default, the Power Meter icon appears in the notification area, at the far right of the taskbar. The icon changes shape to indicate whether the computer is running on battery or external power. To add or remove the power meter icon from the notification area: 1.

  • Page 22: Setting Or Changing A Power Scheme

    Power options Setting or changing a power scheme The Power Schemes tab in the Power Options Properties dialog box assigns power levels to system components. You can assign different schemes, depending on whether the computer is running on battery or external power. You can also set a power scheme that initiates standby or hibernation, or turns off the display or hard drive after a time interval that you specify.

  • Page 23: Setting A Security Prompt

    Power options Setting a security prompt You can add a security feature that prompts you for a password when the computer is turned on, resumes from standby, or restores from hibernation. To set a password prompt: 1. Right-click the Power Meter icon in the notification area, and then click Adjust Power Properties.

  • Page 24: Processor Performance Controls

    Processor performance controls Ä CAUTION: To prevent overheating, do not obstruct vents. Use the computer only on a hard flat surface. Do not allow another hard surface, such as an adjoining printer, or a soft surface, such as pillows or thick rugs or clothing, to block airflow. ✎...

  • Page 25

    Processor performance controls After a power scheme has been set, no other intervention is required to control the performance of the computer processor. The following table describes the processor performance on external and battery power for the available power schemes. Processor Performance Processor Performance Power Scheme...

  • Page 26: Battery Packs

    Battery packs When a charged battery pack is in the computer and the computer is not plugged into external power, the computer runs on battery power. When the computer is plugged into external AC power, the computer runs on AC power. If the computer contains a charged battery pack and is running on external AC power supplied through the AC adapter, the computer switches to battery power if the AC adapter is...

  • Page 27: Inserting Or Removing A Battery Pack

    Battery packs Inserting or removing a battery pack Ä CAUTION: To prevent loss of work when removing a battery pack that is the sole power source, initiate hibernation or turn off the computer before removing the battery pack. ✎ Battery packs may vary in appearance. To insert a battery pack: 1.

  • Page 28

    Battery packs To remove a battery pack: 1. Turn the computer upside down with the battery bay facing away from you. 2. Slide the battery pack release latch 1 to release the battery pack. 3. Pivot the battery pack away from the computer 2 and remove it from the battery bay 3.

  • Page 29: Charging A Battery Pack

    Battery packs Charging a battery pack To prolong battery life and optimize the accuracy of battery charge displays: Å WARNING: Do not charge the computer battery pack on board aircraft. Charging the battery pack may damage aircraft electronic systems. ■ If you are charging a new battery pack: ❏...

  • Page 30: Monitoring The Battery Pack Charge

    Battery packs A battery pack inserted in the computer charges whether the computer is off or in use, but the battery pack charges faster while the computer is off. Charging may be delayed if a battery pack is new, has been unused for 2 weeks or more, or is much warmer or cooler than room temperature.

  • Page 31: Displaying Charge Information On The Screen

    Battery packs Displaying charge information on the screen This section explains how to access and interpret battery charge indicators. Viewing charge displays To view information about the status of any battery pack in the computer: ■ Double-click the Power Meter icon in the notification area, at the far right of the taskbar.

  • Page 32: Identifying Low-battery Conditions

    Battery packs Identifying low-battery conditions This section explains how to identify low-battery and critical low-battery conditions. Low-battery condition When a battery pack that is the sole power source for the computer reaches a low-battery condition, the battery light blinks. Critical low-battery condition If a low-battery condition is not resolved, the computer enters a critical low-battery condition, and the battery light blinks rapidly.

  • Page 33: Resolving Low-battery Conditions

    Battery packs Resolving low-battery conditions Ä CAUTION: To reduce the risk of losing information when the computer reaches a critical low-battery condition and has initiated hibernation, do not restore power until the power lights are turned off. When external power is available To resolve a low-battery condition when external power is available, connect one of the following: ■...

  • Page 34: Calibrating A Battery Pack

    Battery packs When the computer cannot restore from hibernation To resolve a low-battery condition when the computer lacks the power to restore from hibernation: 1. Insert a charged battery pack or plug the computer into external power. 2. Restore from hibernation by pressing the power button. Calibrating a battery pack Three steps are involved in calibrating a battery pack: fully charging, fully discharging, and then fully recharging.

  • Page 35: How To Calibrate

    Battery packs How to calibrate Three steps are involved in calibrating a battery pack: fully charging, fully discharging, and then fully recharging. Step 1: Charging the battery pack A battery pack can charge whether the computer is off or in use, but it will charge faster when the computer is off.

  • Page 36

    Battery packs The computer must remain on when the battery pack is being discharged. The battery pack can discharge whether or not you are using the computer but will discharge faster when the computer is in use. ■ If you plan to leave the computer unattended during the discharge, save your information before beginning the discharge procedure.

  • Page 37

    Battery packs 5. Disconnect the computer from its external power source, but do not turn off the computer. 6. Run the computer on battery power until the battery pack is fully discharged. The battery light begins to blink when the battery pack has discharged to a low-battery condition.

  • Page 38: Conserving Battery Power

    Battery packs Conserving battery power Using the battery conservation procedures and settings described in this section extends the life of a battery pack. Conserving power as you work To conserve power as you use the computer: ■ Turn off wireless and local area network (LAN) connections and exit modem applications when you are not using them.

  • Page 39: Selecting Power Conservation Settings

    Battery packs Selecting power conservation settings To set the computer to conserve power: ■ Select a short wait for the screen saver and select a screen saver with minimal graphics and motion. To access screen saver settings: Select Start > Control Panel > Appearance and Themes > Choose a screen saver.

  • Page 40

    Index conservation, power 7–13 critical low-battery condition battery charge information 7–5 7–7 battery light displaying charge status 7–7 display switch, identifying 1–1 identifying 1–2 drive media 3–5 battery pack battery power vs. AC emergency shutdown power 7–1 procedures 4–3 calibrating 7–9 charging 7–4 7–10 conserving power 7–13...

  • Page 41

    Index resuming from 4–4 switch, display 1–1 operating system 4–2 optional power adapter 2–1 7–10 temperature, storage, battery pack 7–14 traveling with the computer, passwords, security 5–4 battery pack temperature power considerations 7–14 conserving 7–13 turning off the computer 4–2 control and light locations 4–3 1–1...

  • Page 42

    © Copyright 2005 Hewlett-Packard Development Company, L.P. Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation. The information contained herein is subject to change without notice. The only warranties for HP products and services are set forth in the express warranty statements accompanying such products and services.

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