HP Elitebook 840 G2 P0c57ut Aba 14 Notebook User Manual

							1.Connect an external hub (purchased separately) to the DisplayPort on your computer, using a DP-to-DP 
cable (purchased separately). Be sure that the hub power adapter is connected to AC power.
2.Connect your external display devices to the VGA ports, or DisplayPorts on the hub.
3.For details on how to set up multiple displays, press fn+f4. If you don’t see one of your connected 
displays, be sure that each device is connected to the correct port on the hub.
NOTE:Multiple display choices include Duplicate, which mirrors your computer screen on all enabled 
displays, or 
Extend, which spans your computer screen across all enabled displays.
Connect displays to computers with Intel graphics (with an optional hub)
NOTE:With an Intel graphics controller, you can connect up to 3 display devices. 
To set up multiple displays, follow these steps:
1.Connect an external hub (purchased separately) to the DisplayPort on your computer, using a DP-to-DP 
cable (purchased separately). Be sure that the hub power adapter is connected to AC power.
2.Connect your external display devices to the VGA ports or DisplayPorts on the hub.
3.When Windows detects a monitor connected to the DP hub, the DisplayPort Topology Notification 
dialog box is displayed. Click the appropriate options to configure your displays. Multiple display choices 
include 
Duplicate, which mirrors your computer screen on all enabled displays, or Extend, which 
extends the screen image across all enabled displays.
NOTE:If this dialog box does not appear, be sure that each external device is connected to the correct 
port on the hub. For more information, press 
fn+f4 and then follow the on-screen instructions.
Video39    
						

							Connect displays to computers with Intel graphics (with a built-in hub)
With your internal hub and Intel graphics controller, you can connect up to 3 display devices in the following 
configurations:
●Two 1920 x 1200 DP monitors + one 1920 x 1200 VGA monitor connected to an optional docking station
●One 2560 x 1600 DP monitor + one 1920 x 1200 VGA monitor connected to an optional docking station
To set up multiple displays, follow these steps:
1.Connect your external display devices to the VGA ports or DisplayPorts (DP) on the computer base or the 
docking station.
2.When Windows detects a monitor connected to the DP hub, the DisplayPort Topology Notification 
dialog box is displayed. Click the appropriate options to configure your displays. Multiple display choices 
include 
Duplicate, which mirrors your computer screen on all enabled displays, or Extend, which 
extends the screen image across all enabled displays.
NOTE:If this dialog box does not appear, be sure that each external device is connected to the correct 
port on the hub. For more information, press 
fn+f4 and then follow the on-screen instructions.
Discovering and connecting Miracast-compatible wireless displays (select models 
only)
To discover and connect to Miracast-compatible wireless displays without leaving your current apps, follow 
the steps below.
To open Miracast:
▲Point to the upper-right or lower-right corner of the Start screen to display the charms, click Devices, 
click 
Project, and then follow the on-screen instructions.
– or –
On select computer models, from the Start screen, click the HP Quick Access to Miracast icon, and then 
follow the on-screen instructions.
40Chapter 5   Multimedia  
						

							6Power management
NOTE:A computer may have a power button or a power switch. The term power button is used throughout 
this guide to mean both types of power controls.
Shutting down the computer
CAUTION:Unsaved information is lost when the computer shuts down.
The shutdown command closes all open programs, including the operating system, and then turns off the 
display and computer.
Shut down the computer under any of the following conditions:
●When you need to replace the battery or access components inside the computer
●When you are connecting an external hardware device that does not connect to a Universal Serial Bus 
(USB) port
●When the computer will be unused and disconnected from external power for an extended period
Although you can turn off the computer with the power button, the recommended procedure is to use the 
Windows shutdown command:
NOTE:If the computer is in the Sleep state or in Hibernation, you must first exit Sleep or Hibernation before 
shutdown is possible by briefly pressing the power button.
1.Save your work and close all open programs.
2.Select Start > Shut Down.
If the computer is unresponsive and you are unable to use the preceding shutdown procedure, try the 
following emergency procedures in the sequence provided:
●Press ctrl+alt+delete. Click the Power icon, and then click Shut Down.
●Press and hold the power button for at least 5 seconds.
●Disconnect the computer from external power.
●On models with a user-replaceable battery, remove the battery.
Setting power options
Using power-saving states
Sleep is enabled at the factory.
When Sleep is initiated, the power lights blink and the screen clears. Your work is saved to memory. 
CAUTION:To reduce the risk of possible audio and video degradation, loss of audio or video playback 
functionality, or loss of information, do not initiate Sleep while reading from or writing to a disc or an 
external memory card.Shutting down the computer41     
						

							NOTE:You cannot initiate any type of networking connection or perform any computer functions while the 
computer is in the Sleep state.
Intel Rapid Start Technology (select models only)
For select models, the Intel Rapid Start Technology (RST) feature is enabled by default. Rapid Start 
Technology allows your computer to resume quickly from inactivity.
Rapid Start Technology manages your power-saving options as follows:
●Sleep—Rapid Start Technology allows you to select the Sleep state. To exit from Sleep, press any key, 
activate the TouchPad, or press the power button briefly.
●Hibernation—Rapid Start Technology initiates Hibernation after a period of inactivity while in the Sleep 
state when running on battery power or on external power or when the battery reaches a critical level. 
After Hibernation is initiated, press the power button to resume your work.
NOTE:Rapid Start Technology can be disabled in Setup Utility (BIOS). If you want to be able to initiate the 
Hibernation state, you must enable user-initiated Hibernation using Power Options. See 
Initiating and exiting 
Hibernation on page 42.
Initiating and exiting Sleep
With the computer on, you can initiate Sleep in any of the following ways:
●Briefly press the power button.
●Close the display.
●Select Start, click the arrow next to the Shut down button, and then click Sleep.
To exit Sleep
●Briefly press the power button.
●If the display is closed, open the display.
●Press a key on the keyboard.
●Tap or swipe the TouchPad
When the computer exits Sleep, the power lights turn on and the computer returns to the screen where you 
stopped working.
NOTE:If you have set a password to be required on wakeup, you must enter your Windows password 
before the computer will return to the screen.
Initiating and exiting Hibernation
The system is set at the factory to initiate Hibernation after a period of inactivity when running on battery  power or on external power, or when the battery reaches a critical battery level.
Power settings and timeouts can be changed in Windows Control Panel.
To initiate Hibernation
▲Select Start, click the arrow next to the Shut down button, and then click Hibernate.
To exit Hibernation:
▲Briefly press the power button.
The power lights turn on and your work returns to the screen where you stopped working.
42Chapter 6   Power management    
						

							NOTE:If you have set a password to be required on wakeup, you must enter your Windows password 
before your work will return to the screen.
Using the power meter and power settings
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 reveal the percentage of remaining battery charge and the current power plan, point over the power  meter icon.
●To use Power Options, or to change the power plan, click the power meter icon and select an item from 
the list.
Different power meter icons indicate whether the computer is running on battery or external power. The icon 
also reveals a message if the battery has reached a low or critical battery level.
Setting password protection on wakeup
To set the computer to prompt for a password when the computer exits Sleep or Hibernation, follow these 
steps:
1.Select Start > Control Panel > System and Security > Power Options.
2.In the left pane, click Require a password on wakeup.
3.Click Change Settings that are currently unavailable.
4.Click Require a password (recommended).
NOTE:If you need to create a user account password or change your current user account password, 
click 
Create or change your user account password, and then follow the on-screen instructions. If you 
do not need to create or change a user account password, go to step 5.
5.Click Save changes.
Using battery 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.
The computer runs on battery power whenever it is not plugged into external AC power. Computer battery 
life varies, depending on power management settings, running programs, display brightness, external 
devices connected to the computer, and other factors. 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. If the computer contains a charged battery and is running on external AC power, the computer 
automatically switches to battery power if the AC adapter is disconnected on the computer or an AC power 
loss occurs.
NOTE:When you disconnect AC power, the display brightness is automatically decreased to save battery 
life. Select computer models can switch between graphic modes to increase battery life. For more 
information, see 
Switchable graphics/dual graphics (select models only) on page 49.
Finding additional battery information
Help and Support provides the following tools and information about the battery:
Setting power options43     
						

							●Battery Check tool to test battery performance
●Information on calibration, power management, and proper care and storage to maximize battery life
●Information on battery types, specifications, life cycles, and capacity
To access battery information:
▲Select Start > Help and Support > Learn > Power Plans: Frequently Asked Questions.
Using Battery Check
Help and Support provides information on the status of the battery installed in the computer.
To run Battery Check:
1.Connect the AC adapter to the computer.
NOTE:The computer must be connected to external power for Battery Check to work properly.
2.Select Start > Help and Support > Troubleshoot > Power, Thermal, and Mechanical.
3.Click the Power tab, and then click Battery Check.
Battery Check examines the battery and its cells to see if they are functioning properly, and then reports the 
results of the examination.
Displaying the remaining battery charge
▲Move the pointer over the power meter icon on the Windows desktop in the notification area, at the far 
right of the taskbar.
Maximizing battery discharge time
Battery discharge time varies depending on features you use while on battery power. Maximum discharge  time gradually decreases as the battery storage capacity naturally degrades.
Tips for maximizing battery discharge time:
●Lower the brightness on the display.
●Remove the battery on the computer when it is not being used or charged, if the computer contains a user-replaceable battery
●Store the user-replaceable battery in a cool, dry location.
●Select the Power saver setting in Power Options.
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. 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 or critical battery level, the  following behavior occurs:
●The battery light (select models only) indicates a low or critical battery level.
– or –
44Chapter 6   Power management  
						

							●The power meter icon in the notification area shows a low or critical battery notification.NOTE:For additional information about the power meter, see Using the power meter and power 
settings on page 43.
If the computer is on or in the Sleep state, the computer remains briefly in the Sleep state, and then shuts 
down and loses any unsaved information.
Resolving a low battery level
Resolving a low battery level when external power is available
▲Connect one of the following devices:
●AC adapter
●Optional docking or expansion device
●Optional power adapter purchased as an accessory from HP
Resolving a low battery level when no power source is available
To resolve a low battery level when no power source is available, save your work and shut down the 
computer.
Inserting or removing the battery
Inserting a battery
To insert the battery:
1.Turn the computer upside down on a flat surface, with the battery bay toward you.
2.Remove the service door (see Removing or replacing the service door on page 57).
Setting power options45  
						

							3.Insert the battery (1) into the battery bay at an angle and then press down on the battery (2) until it is 
fully seated .
On select models, the battery release latch (3) automatically locks the battery into place.
Removing a battery
To remove the battery:
CAUTION:Removing a battery that is the sole power source for the computer can cause loss of information. 
To prevent loss of information, save your work and shut down the computer through Windows before 
removing the battery.
1.Turn the computer upside down on a flat surface, with the battery bay toward you.
2.Remove the service door (see Removing or replacing the service door on page 57).
3.Slide the battery release latches (1) to release the battery, and then lift the battery (2).
46Chapter 6   Power management  
						

							4.Remove the battery from the computer (3).
Conserving battery power
●Select low power-use settings through Power Options in Windows Control Panel.
●Turn off wireless and LAN connections and exit modem applications when you are not using them.
●Disconnect unused external devices that are not plugged into an external power source.
●Stop, disable, or remove any external memory cards that you are not using.
●Decrease screen brightness.
●Before you leave your work, initiate Sleep, or shut down the computer.
Storing a user-replaceable battery (select models only)
CAUTION:To reduce the risk of damage to a battery, 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 user-
replaceable battery and store it separately.
To prolong the charge of a stored battery, place it in a cool, dry place.
NOTE:A stored battery should be checked every 6 months. If the capacity is less than 50 percent, recharge 
the battery before returning it to storage.
Calibrate a battery before using it if it has been stored for one month or more.
Setting power options47   
						

							Disposing of a user-replaceable battery (select models only)WARNING!To reduce the risk of fire or burns, do not disassemble, crush, or puncture; do not short external 
contacts; do not dispose of in fire or water.
See the Regulatory, Safety and Environmental Notices for proper battery disposal. To access the user guides, 
select the 
Start > Help and Support > User Guides. To access battery information, select Start> Help and 
Support
 > Learn > Power Plans: Frequently Asked Questions.
Replacing a user-replaceable battery (select models only)
Battery Check notifies you to replace the battery when an internal cell is not charging properly or when the 
battery storage capacity has reached a weak condition. If the battery is possibly covered by an HP warranty, 
instructions include a warranty ID. A message refers you to the HP website for more information about 
ordering a replacement battery.
Using external AC power
WARNING!Do not charge the computer battery while you are onboard aircraft.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.NOTE:For information on connecting to AC power, see the Setup Instructions poster provided in the 
computer box.
External AC power is supplied through an approved AC adapter or an optional docking or expansion device.
Connect the computer to external AC power under any of the following conditions:
●When charging or calibrating a battery
●When installing or modifying system software
●When writing information to a CD, a DVD, or a BD (select models only)
●When running Disk Defragmenter
●When performing a backup or recovery
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 power 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.
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 does not turn on.
●The display does not turn on.
●The power lights are off.
48Chapter 6   Power management