HP 4310s - ProBook - Core 2 Duo 2.1 GHz User manual

Power Management
User Guide

© Copyright 2009 Hewlett-Packard
Development Company, L.P.
Windows is a U.S. registered trademark 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.
First Edition: June 2009
Document Part Number: 532129-001
Product notice
This user guide describes features that are
common to most models. Some features
may not be available on your computer.

Table of contents
1 Power control and light locations
2 Setting power options
Using power-saving states ................................................................................................................... 3
Initiating and exiting Standby ............................................................................................... 3
Initiating and exiting Hibernation .......................................................................................... 4
Using the Power Meter ......................................................................................................................... 5
Using power schemes .......................................................................................................................... 6
Viewing the current scheme ................................................................................................ 6
Selecting a different power scheme ..................................................................................... 6
Customizing power schemes ............................................................................................... 6
Setting password protection upon exiting Standby .............................................................................. 7
3 Using external AC power
Connecting the AC adapter .................................................................................................................. 9
Testing an AC adapter ....................................................................................................................... 10
4 Using battery power
Displaying the remaining battery charge ............................................................................................ 12
Inserting or removing the battery ........................................................................................................ 13
Charging a battery .............................................................................................................................. 15
Managing low battery levels ............................................................................................................... 16
Identifying low battery levels .............................................................................................. 16
Resolving a low battery level ............................................................................................. 17
Resolving a low battery level when external power is available ........................ 17
Resolving a low battery level when a charged battery is available ................... 17
Resolving a low battery level when no power source is available ..................... 17
Resolving a low battery level when the computer cannot exit Hibernation ....... 17
Calibrating a battery ........................................................................................................................... 18
Step 1: Fully charge the battery ......................................................................................... 18
Step 2: Disable Hibernation and Standby .......................................................................... 18
Step 3: Discharge the battery ............................................................................................ 19
Step 4: Fully recharge the battery ...................................................................................... 20
Step 5: Reenable Hibernation and Standby ...................................................................... 20
iii

Conserving battery power .................................................................................................................. 21
Storing a battery ................................................................................................................................. 22
Disposing of a used battery ................................................................................................................ 23
5 Shutting down the computer
Index ................................................................................................................................................................... 25
iv

1 Power control and light locations
The following illustration and table identify and describe the power control and light locations.
NOTE: Your computer may look slightly different from the illustration in this section.
Component Description
(1) Internal display switch Turns off the display if the display is closed while the power is on.
(2) fn+f5 Initiates Standby.
(3) Power light ●On: The computer is on.
●Blinking: The computer is in Standby.
●Off: The computer is off or in Hibernation.
(4) Power button ●When the computer is off, press the button to turn on the
computer.
●When the computer is on, press the button to shut down the
system.
●When the computer is in Standby, press the button briefly to
exit Standby.
●When the computer is in Hibernation, press the button briefly
to exit Hibernation.
If the computer has stopped responding and Windows® shutdown
procedures are ineffective, press and hold the power button for at
least 5 seconds to turn off the computer.
1

Component Description
To learn more about your power settings, select Start >Control
Panel >Performance and Maintenance >Power Options.
2 Chapter 1 Power control and light locations

2 Setting power options
Using power-saving states
The computer has two power-saving states enabled at the factory: Standby and Hibernation.
When Standby is initiated, the power lights blink and the screen clears. Your work is saved to memory.
Exiting Standby is faster than exiting Hibernation. If the computer is in Standby for an extended period
or if the battery reaches a critical battery level while in Standby, the computer initiates Hibernation.
When Hibernation is initiated, your work is saved to a hibernation file on the hard drive and the computer
turns off.
CAUTION: To prevent possible audio and video degradation, loss of audio or video playback
functionality, or loss of information, do not initiate Standby or Hibernation while reading from or writing
to a disc or an external media card.
NOTE: You cannot initiate any type of networking connection or perform any computer functions while
the computer is in Standby or in Hibernation.
NOTE: When HP 3D DriveGuard has parked a drive, the computer will not initiate Standby or
Hibernation, and the display will be turned off.
Initiating and exiting Standby
The system is set at the factory to initiate Standby after 10 minutes of inactivity when running on battery
power and 25 minutes of inactivity when running on external power.
Power settings and timeouts can be changed using Power Options in Windows® Control Panel.
With the computer on, you can initiate Standby in any of the following ways:
●Press fn+f5.
●Click Start >Turn Off Computer >Stand By.
If Stand by is not displayed, follow these steps:
a. Click the down arrow.
b. Select Stand by from the list.
c. Click OK.
To exit Standby:
▲Press the power button.
Using power-saving states 3

When the computer exits Standby, the power lights turn on and your work returns to the screen
where you stopped working.
NOTE: If you have set a password to be required when the computer exits Standby, you must enter
your Windows password before your work will return to the screen.
Initiating and exiting Hibernation
The system is set at the factory to initiate Hibernation after 30 minutes of inactivity when running on
battery power or when the battery reaches a critical battery level.
NOTE: The system will not initiate Hibernation when running on external power.
Power settings and timeouts can be changed using Power Options in Windows Control Panel.
To initiate Hibernation:
1. Select Start >Turn Off Computer.
2. Hold down the shift key and select Hibernate.
If Hibernate is not displayed, follow these steps:
a. Click the down arrow.
b. Select Hibernate from the list.
c. Click OK.
To exit Hibernation:
▲Press the power button.
The power lights turn on and your work returns to the screen where you stopped working.
NOTE: If you have set a password to be required when the computer exits Hibernation, you must enter
your Windows password before your work will return to the screen.
4 Chapter 2 Setting power options

Using the Power Meter
The Power Meter is located in the notification area, at the far right of the taskbar. The Power Meter
allows you to quickly access power settings and view the remaining battery charge.
●To access Power Options, right-click the Power Meter icon and select Adjust Power
Properties.
●To display the percentage of remaining battery charge, double-click the Power Meter icon.
Different battery meter icons indicate whether the computer is running on battery or external power.
To remove the Power Meter icon from the notification area, follow these steps:
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. Click Apply, and then click OK.
To show the Power Meter icon in the notification area, follow these steps:
1. Select Start >Control Panel >Performance and Maintenance >Power Options.
2. Click the Advanced tab.
3. Select the Always show icon on the taskbar check box.
4. Click Apply, and then click OK.
NOTE: If you cannot see an icon you have placed in the notification area, click the Show Hidden
Icons icon (<or <<) in the notification area.
Using the Power Meter 5

Using power schemes
A power scheme is a collection of system settings that manages how the computer uses power. Power
schemes can help you conserve power and maximize computer performance.
The following power schemes are available:
●Portable/Laptop (recommended)
●Home/Office Desk
●Presentation
●Always On
●Minimal Power Management
●Max Battery
You can change the settings of these power plans through Power Options.
Viewing the current scheme
▲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.
Selecting a different power scheme
▲Click the Power Meter icon in the notification area, at the far right of the taskbar, and then select
a power scheme from the list.
– or –
a. Select Start >Control Panel >Performance and Maintenance >Power Options.
b. Select a power scheme from the Power schemes list.
c. Click OK.
Customizing power schemes
1. Select Start >Control Panel >Performance and Maintenance >Power Options.
2. Select a power scheme from the Power schemes list.
3. Modify the Plugged in and Running on batteries settings as needed.
4. Click OK.
6 Chapter 2 Setting power options

Setting password protection upon exiting Standby
To set the computer to prompt for a password when the computer exits Standby, follow these steps:
1. Right-click the Power Meter icon in the notification area, and then click Adjust Power
Properties.
2. Click the Advanced tab.
3. Select the Prompt for password when computer resumes from standby check box.
4. Click Apply.
Setting password protection upon exiting Standby 7

3 Using external AC power
External AC power is supplied through an AC adapter or 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 compatible AC adapter purchased from HP.
Connect the computer to external AC power under any of the following conditions:
WARNING! Do not charge the computer battery while you are onboard aircraft.
●When you are charging or calibrating a battery
●When you are installing or modifying system software
●When you are writing information to a CD or DVD
When you connect the computer to external AC power, the following events occur:
●The battery begins to charge.
●If the computer is turned on, the battery meter icon in the notification area changes appearance.
When you disconnect external AC power, the following events occur:
●The computer switches to battery power.
●The display brightness is automatically decreased to save battery life. To increase display
brightness, press the fn+f8 hotkey or reconnect the AC adapter.
8 Chapter 3 Using external AC power

Connecting the AC adapter
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 the power cord, plug the cord into a grounded (earthed) 3-
pin outlet. Do not disable the power cord grounding pin, for example, by attaching a 2-pin adapter. The
grounding pin is an important safety feature.
To connect the computer to external AC power:
1. Plug the AC adapter into the power connector (1) on 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).
Connecting the AC adapter 9

Testing an AC adapter
Test the AC adapter if the computer exhibits any of the following symptoms when it is connected to AC
power:
●The computer will not turn on.
●The display does not turn on.
●The power light is off.
To test the AC adapter:
1. Remove the battery from the computer.
a. Turn the computer upside down on a flat surface, with the battery bay toward you.
b. Slide the battery release latch (1) to release the battery.
c. Remove the battery (2).
2. Connect the AC adapter to the computer, and then plug it into an AC outlet.
3. Turn on the computer.
●If the power light turns on, the AC adapter is functioning properly.
●If the power light remains off, the AC adapter is not functioning and should be replaced.
Contact technical support for information on obtaining a replacement AC power adapter.
10 Chapter 3 Using external AC power

4 Using battery power
When a charged battery 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 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.
NOTE: The display brightness is decreased to save battery life when you disconnect AC power. To
increase display brightness, use the fn+f8 hotkey or reconnect the AC adapter.
You can keep a battery in the computer or in storage, depending on how you work. Keeping the battery
in the computer whenever the computer is plugged into AC power charges the battery and also protects
your work in case of a power outage. However, a battery in the computer slowly discharges when the
computer is off and unplugged from external power.
WARNING! To reduce potential safety issues, use only the battery provided with the computer, a
replacement battery provided by HP, or a compatible battery purchased from HP.
Computer battery life varies, depending on power management settings, programs running on the
computer, display brightness, external devices connected to the computer, and other factors.
11

Displaying the remaining battery charge
▲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.
Most charge indicators report battery status as both a percentage and as the number of minutes of
charge remaining:
●The percentage indicates the approximate amount of charge remaining in the battery.
●The time indicates the approximate running time remaining on the battery if the battery continues
to provide power at the current level. For example, the time remaining will decrease when a DVD
is playing and will increase when a DVD stops playing.
When a battery is charging, a lightning bolt icon may be superimposed over the battery icon on the
Power Meter screen.
12 Chapter 4 Using battery power

Inserting or removing the battery
CAUTION: Removing a battery that is the sole power source can cause loss of information. To prevent
loss of information, save your work, and initiate Hibernation or shut down the computer through Windows
before removing the battery.
To insert the battery:
1. Turn the computer upside down on a flat surface, with the battery bay toward you.
2. Slide the battery into the battery bay (1) until the battery latch (2) automatically locks the battery
into place.
To remove the battery:
1. Turn the computer upside down on a flat surface, with the battery bay toward you.
2. Slide the battery release latch (1) to release the battery.
Inserting or removing the battery 13

3. Remove the battery (2).
14 Chapter 4 Using battery power

Charging a battery
WARNING! Do not charge the computer battery while you are onboard aircraft.
The battery charges whenever the computer is plugged into external power through an AC adapter or
an optional power adapter.
The battery charges whether the computer is off or in use, but it charges faster when the computer is
off.
Charging may take longer if a battery is new, has been unused for 2 weeks or more, or is much warmer
or cooler than room temperature.
To prolong battery life and optimize the accuracy of battery charge displays, follow these
recommendations:
●If you are charging a new battery, charge it fully before turning on the computer.
●Charge the battery until the battery light turns off.
NOTE: If the computer is on while the battery is charging, the battery meter in the notification
area may show 100 percent charge before the battery is fully charged.
●Allow the battery to discharge below 5 percent of a full charge through normal use before charging
it.
●If the battery has been unused for one month or more, calibrate the battery instead of simply
charging it.
The battery light displays charge status:
●On: The battery is charging.
●Blinking: A battery that is the only available power source has reached a low battery level. When
the battery reaches a critical battery level, the battery light begins blinking rapidly.
●Off: The battery is fully charged, in use, or not installed.
Charging a battery 15

Managing low battery levels
The information in this section describes the alerts and system responses set at the factory. Some low
battery alerts and system responses can be changed using Power Options in Windows Control Panel
(Start >Control Panel >Performance and Maintenance >Power Options). Preferences set using
Power Options do not affect lights.
Identifying low battery levels
When a battery that is the sole power source for the computer reaches a low battery level, the battery
light blinks.
If a low battery level is not resolved, the computer enters a critical battery level, and the battery light
begins blinking rapidly.
The computer takes the following actions for a critical battery level:
●If Hibernation is enabled and the computer is on or in Standby, the computer initiates Hibernation.
●If Hibernation is disabled and the computer is on or in Standby, the computer remains briefly in
Standby, and then shuts down and loses any unsaved information.
16 Chapter 4 Using battery power