Power Document Part Number: 404162-001 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 . . . . . . . . . . 7–7 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 chapter.
Power control and light locations Component Description 1 Display switch Initiates standby if the display is closed while the computer is on. 2 Power lights* (2) 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 3 Power button When the computer is ■ ■ Off, press to turn on the computer. 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. 4 fn+f3 Initiates standby. 5 Battery light Amber: A battery pack is charging.
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). ■ If provided with a 3-pin attachment plug on your power cord, plug the cord into a grounded (earthed) 3-pin outlet.
Power sources Depending on the AC adapter connected, one of the following messages may be displayed after turning on the computer: ■ “Smart AC adapter power output is too low for this computer.” Clicking the message will display the following additional message: “The output power of the HP Smart AC Adapter connected to your computer is insufficient. Please connect a higher capacity adapter.” ■ “For full performance, connect a higher capacity AC adapter.
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 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 ✎ You or 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: 3–4 ■ 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, a DVD, or an external media card. To prevent loss of information, do not initiate standby or hibernation while writing to a CD, a DVD, or an external media card.
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: Power ■ 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 Initiating or resuming from standby Task Procedure Result Initiate standby. ■ With the computer on, press fn+f3. ■ Select Start > Turn Off ■ The power lights Computer > Stand by.* In Windows XP Professional, if Stand by is not displayed: 1. Click the down arrow. 2. Select Stand by from the list. 3. Click OK. blink. ■ The screen clears. ■ Close the computer. Allow the system to initiate standby. No action required.
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. ■ Press the power button. ■ The power lights – or – ■ Select Start > Turn Off Computer.
Default power settings Task Procedure Result Restore from user-initiated or system-initiated hibernation. Press the power button.† ■ The power lights are turned on. ■ Your work returns to the screen. *If you have been registered to a network domain, the button you click will be called Shut Down instead of Turn Off Computer. †If the system initiated hibernation because of a critical low-battery condition, connect external power or insert a charged battery pack before you press the power button.
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” by 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 battery or 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 pillows, thick rugs, 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 the 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. ■ An optional accessory 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.” For more information about leaving your work, refer to “Standby and hibernation.
Battery packs Inserting or removing the primary battery pack Ä CAUTION: To prevent loss of information 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 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 toward 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. Slide the battery pack 3 out of 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 pack ■ Discharge sequence: 1. Optional accessory battery pack 2. Primary battery in the computer battery bay While 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 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: ❏ 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 The battery light displays charge status: ■ On: The battery pack is charging. ■ Blinking: The battery pack has reached a low-battery condition and is not charging. ■ Blinking rapidly: The battery pack has reached a critical low-battery condition and is not charging. ■ Off: The battery pack is fully charged or not installed. For information about determining the amount of charge in a battery pack, refer to “Monitoring the charge of a battery pack.
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. – or – ■ Select Start > Control Panel > Performance and Maintenance > Power Options > Power Meter tab.
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 To charge the battery pack: 1. Insert the battery pack into the computer. 2. Connect the computer to an AC adapter, optional power adapter, or optional docking device, and then plug the adapter or device into external power. The battery light on the computer is turned on. 3. Leave the computer plugged into external power until the battery pack is fully charged. The battery light on the computer is turned off.
Battery packs ■ If you plan to leave the computer unattended during the discharge, save your work before beginning the discharge procedure. ■ If you use the computer occasionally during the discharge procedure and have set energy-saving timeouts, expect the following performance from your system during the discharge process: ❏ The monitor will not turn off automatically. ❏ Hard drive speed will not decrease automatically while the computer is idle. ❏ System-initiated standby will not occur.
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: 7–16 ■ Turn off wireless, local area network (LAN), and wide-area network (WAN) connections, and exit modem applications when you are not using them.
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 battery pack provided with the computer, a replacement battery pack provided by HP, or a compatible battery pack 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.
Index A C AC adapter 1–2, 2–1, 2–2, 2–3, 7–5 calibration, battery 7–12 charging battery packs 7–5 computer display, turning on or off 4–2 conservation, power 7–16 critical low-battery condition 7–9 B battery charge information 7–7 battery light displaying charge status 7–5, 7–9 identifying 1–3 battery pack battery power vs.
Index hibernation file 3–2 hotkeys, fn+f3 1–3, 4–4, 4–5 HP Smart AC Adapter.
© Copyright 2006 Hewlett-Packard Development Company, L.P. Microsoft and Windows are U.S. registered trademarks of Microsoft Corporation. Bluetooth is a trademark owned by its proprietor and used by Hewlett-Packard Company under license. 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.
