Power Document Part Number: 396855-001 March 2006 This guide explains how the computer uses power.
Contents 1 Power control and light locations 2 Power sources Connecting the AC adapter . . . . . . . . . . . . . . . . . . . . 2–2 3 Standby and hibernation Standby. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hibernation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Initiating standby, hibernation or shutdown. . . . . . . . . . . When you leave your work . . . . . . . . . . . . . . . . . . . . When a reliable power supply is unavailable . . . . . .
Contents 6 Processor performance controls 7 Battery packs Identifying battery packs . . . . . . . . . . . . . . . . . . . . . . . . . 7–2 Inserting or removing the primary battery pack. . . . . . . . 7–3 Charging multiple battery packs . . . . . . . . . . . . . . . . . . . 7–5 Charging a battery pack . . . . . . . . . . . . . . . . . . . . . . . . . . 7–6 Monitoring the charge of a battery pack . . . . . . . . . . 7–8 Managing low-battery conditions . . . . . . . . . . . . . . . . .
1 Power control and light locations The following illustration and table identify and describe the power control and light locations. computer may look slightly different from the illustration ✎ Your in this section.
Power control and light locations Component Description 1 On: The computer is on. Blinking: The computer is in standby. Blinking rapidly: An HP Smart AC Adapter (hereafter referred to as AC adapter) with a higher power rating should be connected. Off: The computer is off or in hibernation.
Power control and light locations Component Description 2 When the computer is Power button ■ ■ ■ 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. If the computer has stopped responding and Microsoft® Windows® shutdown procedures cannot be used, press and hold the power button for at least 5 seconds to turn off the computer. 3 fn+f3 Initiates standby.
2 Power sources The computer can run on internal or external AC power. The following table indicates the best power source for common tasks. ✎ Older AC adapters will not work with this computer.
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). ■ 2–2 If provided with a 3-pin attachment plug on the power cord, plug the cord into a grounded (earthed) 3-pin outlet.
Power sources To connect the computer to external AC power: 1. Plug the AC adapter into the power connector 1 on the left side of the computer. 2. Plug the power cord into the AC adapter 2. 3. Plug the other end of the power cord into an AC outlet 3. Depending on the AC adapter connected, one of the following pop-up messages may be displayed after turning on the computer: ■ “Smart AC adapter power output is too low for this computer.
3 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. Connect the computer to an external power source. Standby reduces power to system components that are not in use.
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. ■ Do not add or remove memory modules. ■ Do not insert or remove hard drives or optical drives. ■ Do not connect or disconnect external devices. ■ Do not insert or remove an external media card.
Standby and hibernation Ä CAUTION: To reduce the risk of information loss, save your work before initiating hibernation. You can disable hibernation. However, if hibernation is disabled and the system reaches a low-battery condition, the system will not automatically save your work while power is on or when standby has been initiated.
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. cannot initiate any type of networking communications or ✎ You perform any computer functions while the computer is in standby or hibernation. When you leave your work When standby is initiated, your work is stored in random access memory (RAM), and then the screen is cleared.
Standby and hibernation When a reliable power supply is unavailable Be 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. If you pause your work when the power supply is uncertain, take one of the following actions: Power ■ Save your work, and then initiate standby. ■ Initiate hibernation.
Standby and hibernation When using wireless communication, or readable or writable drive media Ä CAUTION: To prevent possible audio and video degradation, or loss of audio or video playback functionality, do not initiate standby or hibernation while reading or writing to a CD, DVD, or external media card. To prevent loss of information, do not initiate standby or hibernation when writing to a CD or DVD. Standby and hibernation interfere with the use of Bluetooth® and WLAN communication, and media.
4 Default power settings This section explains the default standby, hibernation, and shutdown procedures. For information about changing the function of some of the power features on the computer, refer to “Power options.” The controls and lights discussed in this chapter are illustrated in “Power control and light locations.
Default power settings Turning the computer or display on or off Task Procedure Result Turn on the computer. Press the power button. ■ The power lights are turned on. the power lights ✎ Ifblink rapidly, an AC adapter with a higher power rating should be connected. ■ The operating system loads. Shut down the computer.* 1. Save your work and close all open applications. 2. Shut down the computer through the operating system by selecting Start > Turn Off Computer > Turn Off.
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: ■ Press ctrl+alt+delete. Then, select Shut Down > Turn Off. ■ Press and hold the power button for at least 5 seconds. ■ Disconnect the computer from external power and remove the battery pack.
Default power settings Task Procedure Result Allow the system to initiate standby. No action required: ■ If the computer is running on battery power, the system initiates standby after 10 minutes of computer inactivity (default setting). ■ If the computer is attached to external power, the system initiates standby after 25 minutes of computer inactivity (default setting). ■ Power settings and timeouts can be changed using Power Options in Windows Control Panel. ■ The power lights blink.
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. Task Procedure Result Initiate hibernation. ■ In Windows XP Home, select Start > Turn Off Computer.
Default power settings Task Procedure Result Allow the system to initiate hibernation (with hibernation enabled). No action required. If the computer is running on battery power, the system initiates hibernation ■ After 30 minutes of computer inactivity. ■ When the battery pack(s) reach a critical low-battery condition. ■ The power lights are turned off. ■ The screen clears. settings and ✎ Power timeouts can be changed using Power Options in Windows Control Panel.
5 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: ■ Pressing fn+f3, called the “sleep button” in the operating system, initiates standby. ■ By default, the display switch turns off the display and initiates standby. The display switch is activated by closing the display.
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 remove the Power Meter icon from the notification area: 1. Right-click the Power Meter icon in the notification area, and then click Adjust Power Properties. 2. Click the Advanced tab. 3. Clear the Always show icon on the taskbar check box. 4.
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 a battery pack or on external power. You can also set a power scheme that initiates standby or turns off the display or hard drive after a time interval that you specify. To set a power scheme: 1.
6 Processor performance controls Ä CAUTION: To prevent computer overheating, do not obstruct vents. Use the computer only on a hard, flat surface. Do not allow another hard surface, such as a printer, or a soft surface, such as a pillow, thick rug, or clothing, to block the airflow. Overheating can damage the computer and reduce processor performance. some cases, the computer may operate at a higher speed on ✎ Inexternal power than on battery power.
Processor performance controls After a power scheme has been set, no other intervention is required to control the performance of your computer processor. The following table describes the processor performance on external and battery power for the available power schemes. Processor performance while on external power Processor performance while on battery power Home/Office Desk Always runs at the highest performance state. Performance state is determined based on CPU demand.
7 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 disconnected from the computer.
Battery packs Identifying battery packs This computer supports up to 2 battery packs: ■ One primary lithium-ion battery pack is included with the computer. ■ The accessory battery pack is an optional battery pack that can be attached to the bottom of the computer. If the computer will be unused and disconnected from external power for more than 2 weeks, remove the battery pack and store it as described in “Storing a battery pack.
Battery packs Inserting or removing the primary 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 by model. To insert a primary battery pack: 1. Turn the computer upside down on a flat surface, with the battery bay toward you. 2. Slide the battery pack 1 into the battery bay until it is seated.
Battery packs To remove a primary battery pack: 1. Turn the computer upside down on a flat surface, with the battery bay facing you. 2. Slide the right-hand battery pack release latch 1 to the right. 3. Slide and hold the left-hand battery pack release latch 2 to the right. 4. Remove the battery pack 3 from the computer.
Battery packs Charging multiple battery packs Multiple battery packs in the system charge and discharge in a preset sequence: ■ Charge sequence: 1. Primary battery in the computer battery bay 2. Optional accessory battery ■ Discharge sequence: 1. Optional accessory battery 2. Primary battery in the computer battery bay When a battery pack is charging, the battery light on the computer is amber. When the battery pack is almost fully charged, the battery light is green.
Battery packs Charging a battery pack To prolong battery life and optimize 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: ❏ Charge the battery pack while the computer is plugged into external power through the AC adapter. ❏ When you charge the battery pack, charge it fully before turning on the computer.
Battery packs A battery pack inserted in the computer charges whenever the computer is plugged into external power through an AC adapter, an optional docking device, or an optional power adapter. 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.
Battery packs Monitoring the charge of a battery pack This section explains several ways to determine the amount of charge in a battery pack. Obtaining accurate charge information To increase the accuracy of all battery charge indicators: ■ Allow a battery pack to discharge to about 10 percent of a full charge through normal use before charging it. ■ When you charge a battery pack, charge it fully before turning on the computer.
Battery packs Interpreting Charge Indicators Most charge indicators report battery status as both a percentage and as the number of minutes of charge remaining: Power ■ The percentage indicates the approximate amount of charge remaining in the battery pack. ■ The time indicates the approximate running time remaining on the battery pack if the battery pack continues to provide power at the current level.
Battery packs Managing low-battery conditions The information in this section describes the alerts and system responses set at the factory. Some low-battery condition alerts and system responses can be changed using Power Options in Windows Control Panel. Preferences set using Power Options do not affect lights. Identifying low-battery conditions This section explains how to identify low-battery and critical 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.
Battery packs When no power source is available To resolve a low-battery condition when no power source is available: ■ Initiate hibernation. – or – ■ Save your work and shut down the computer. 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.
Battery packs Calibrating a battery pack When to calibrate Even if a battery pack is heavily used, it should not be necessary to calibrate it more than once a month. It is not necessary to calibrate a new battery pack before first use.
Battery packs 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. Å WARNING: Do not charge the computer battery pack on board aircraft. Charging the battery pack may damage aircraft electronic systems. To charge the battery pack: 1. Insert the battery pack into the computer. 2.
Battery packs Step 2: Discharging the battery pack Before you begin a full discharge, disable hibernation. To disable hibernation: 1. Select Start > Control Panel > Performance and Maintenance > Power Options > Hibernate tab. 2. Clear the Enable hibernation check box. 3. Click Apply. 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 while the computer is in use.
Battery packs To fully discharge a battery pack: 1. Right-click the Power Meter icon in the notification area, at the far right of the taskbar, and then click Adjust Power Properties. – or – Select Start > Control Panel > Performance and Maintenance > Power Options > Power Schemes tab. 2. Record the 4 settings in the Running on batteries and Plugged in columns so that you can reset them after the calibration. 3. Set the 4 options to Never. 4. Click OK. 5.
Battery packs Step 3: Recharging the battery pack To recharge the battery pack: 1. Plug the computer into external power and maintain external power until the battery pack is fully recharged. When the battery pack is recharged, the battery light on the computer is turned off. You can use the computer while the battery pack is recharging, but the battery pack will charge faster if the computer is off. 2.
Battery packs Conserving battery power Using the battery conservation procedures and settings described in this section extends the time that a battery pack can run the computer from a single charge. Conserving power as you work To conserve power as you use the computer: 7–18 ■ Turn off wireless and local area network (LAN) connections and exit modem applications when you are not using them. ■ Disconnect external devices you are not using that are not plugged into an external power source.
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. ■ Power Select a Power Scheme with low-power-use settings through the operating system. For more information, refer to “Setting or changing a power scheme.
Battery packs Storing a battery pack Å WARNING: To avoid potential safety issues, only the AC adapter provided with the computer, a replacement AC adapter provided by HP, or an AC adapter purchased as an accessory from HP should be used with the computer. Ä CAUTION: To prevent damage to a battery pack, do not expose it to high temperatures for extended periods of time. If a computer will be unused and unplugged from external power for more than 2 weeks, remove the battery pack and store it separately.
Battery packs Disposing of a used battery pack Å WARNING: To reduce the risk of fire or burns, do not disassemble, crush, or puncture a battery pack; short the external contacts on a battery pack; or dispose of a battery pack in fire or water. Do not expose a battery pack to temperatures above 60°C (140°F). Replace this battery pack only with the battery pack approved for this computer. Refer to the Regulatory, Safety, and Environmental Notices for battery disposal information.
Index A C AC adapter 1–2, 2–1, 2–3, 7–1, 7–5 calibration, battery 7–13 charging battery packs 7–6 conservation, power 7–18 critical low-battery condition 7–10 B battery charge information 7–8 battery light displaying charge status 7–7, 7–10 identifying 1–3 battery pack battery power vs.
Index hotkeys, fn+f3 1–3, 4–3 HP Smart AC Adapter.
© Copyright 2006 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. Nothing herein should be construed as constituting an additional warranty. HP shall not be liable for technical or editorial errors or omissions contained herein.
