Power Document Part Number: 405776-001 May 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 fn+f3 Initiates standby. 2 Power switch When the computer is ■ Off, slide toward the front of the computer and release to turn on the computer. ■ In standby, slide toward the front of the computer and release to exit standby. ■ In hibernation, slide toward the front of the computer and release to exit hibernation.
Power control and light locations Component Description 3 Power lights (2)* On: The computer is on. Blinking: The computer is in standby. Off: The computer is off or in hibernation. 4 Battery light Amber: A battery pack is charging. Green: A battery pack is close to full charge capacity. Blinking amber: A battery pack that is the only available power source has reached a low-battery condition. When the battery reaches a critical low-battery condition, the battery light begins blinking rapidly.
2 Power sources The computer can run on internal or external AC power. The following table indicates the best power sources 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.
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 any 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 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 If you pause your work when the power supply is uncertain, take one of the following actions: ■ Save your work, and then initiate standby. ■ Initiate hibernation. ■ Shut down the computer. 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.
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. Slide the power switch toward the front of the computer. ■ ■ Shut down the computer. 1. 2. Save your work and close all open programs. Shut down the computer through the operating system by selecting Start > Turn Off Computer > Turn Off.* ■ ■ ■ The power lights are turned on. The operating system loads. The power lights are turned off. The operating system shuts down.
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. ■ Slide the power switch toward the front of the computer and hold for at least 5 seconds.
Default power settings Initiating or resuming from standby Task Procedure Result Initiate standby. ■ With the computer on, press fn+f3. Select Start > Turn Off 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. Close the computer. ■ No action required. ■ If the computer is running on battery power, the system initiates standby after 10 minutes of computer inactivity (default setting).
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. ■ ■ Select Start > Turn Off Computer. Then, hold down the shift key as you select Hibernate.
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 switch. 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. 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 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 pillow, thick rugs, or clothing, to block the airflow. Overheating can damage the computer and reduce processor performance. some cases, a 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. ■ An optional accessory battery pack 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 Chapter 3, “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 may vary in appearance by model. To insert a primary battery pack: 1. Turn the computer upside down on a flat surface, with the front of the computer toward you. 2. Slide the battery pack 1 into the battery bay until it is seated. 3.
Battery packs To remove a primary battery pack: 1. Turn the computer upside down on a flat surface, with the front of the computer toward you. 2. Slide the battery release latch 1 toward the rear of the computer. 3. Lift and remove the battery pack 2 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 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 The primary battery pack charges when it is inserted into the computer and the computer is plugged into external power. External power can be supplied through the following: Å ■ AC adapter included with the computer ■ Optional docking device ■ Optional power adapter WARNING: To reduce potential safety issues, use only the AC adapter provided with the computer, a replacement AC adapter provided by HP, or a Smart AC adapter purchased as an accessory from HP.
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 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 on 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 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 sliding the power switch toward the front of the computer. 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.
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 while onboard aircraft. To charge the battery pack: 1. Insert the battery pack into the computer. 2. Connect the computer to an AC adapter, an optional power adapter, or optional docking device, and then plug the adapter or device into external power.
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: Power ■ Turn off wireless, and local area network (LAN) connections, and exit modem software when you are not using it. ■ 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. ■ 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 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 the battery pack only with a battery pack approved for this computer. Refer to Regulatory, Safety and Environmental Notices for battery pack disposal information.
Index A AC adapter, connecting 2–2 B battery bay, primary, removing battery pack 7–4 battery charge displays increasing accuracy 7–7 interpreting 7–8 battery light displaying charge status 7–5, 7–7 identifying 1–3 battery pack calibrating 7–11 charging 7–5, 7–6 discharging 7–12 disposing of 7–17 identifying 7–2 inserting 7–3 monitoring charge 7–7 recharging 7–14 removing 7–4 storing 7–1, 7–16 battery power conserving 7–15 Power low-battery conditions 7–9, 7–10 See also battery pack battery release latch
Index hotkeys fn+f10 7–15 fn+f11 7–15 fn+f3 1–2 fn+f4 7–15 fn+f9 7–15 I initiating hibernation 4–5 initiating standby 4–4 L lightning bolt icon 7–8 low-battery conditions identifying 7–9 resolving 7–10 P password, setting a 5–3 power See also battery power power lights 1–3 Power Meter icon 5–2 power scheme, setting a 5–3 power switch 1–2, 7–11 power, switching between AC and battery 7–1 S security password, setting a 5–3 shutting down the computer 4–2 sleep button 5–1 standby defined 3–1 exiting 1–2 in
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