HP Elitebook 840 G2 P0c57ut Aba 14 Notebook User Manual

							4.Select your computer model, and then select your operating system.
5.In the Diagnostic section, click HP UEFI Support Environment.
– or –
Click Download, and then select Run.
Using HP PC Hardware Diagnostics (UEFI) (select models only)89 
						

							13Using HP Sure Start
Using HP Sure Start (select models only)
Select computer models are configured with HP Sure Start, a technology that continuously monitors the 
computer's BIOS for attacks or corruption. If the BIOS becomes corrupted or is attacked, HP Sure Start 
automatically restores the BIOS to its previously safe state, without user intervention. HP Sure Start is  configured and already enabled so that most users can use the HP Sure Start default configuration. The 
default configuration can be customized by advanced users.
To access the latest documentation on HP Sure Start, go to http://www.hp.com/support, and select your 
country. Select 
Drivers & Downloads, and then follow the on-screen instructions.
90Chapter 13   Using HP Sure Start 
						

							14Support
Contacting support
If the information provided in this user guide or Help and Support does not address your questions, you can contact support. For U.S. support, go to 
http://www.hp.com/go/contactHP. For worldwide support, go to 
http://welcome.hp.com/country/us/en/wwcontact_us.html.
Here you can:
●Chat online with an HP technician.
NOTE:When support chat is not available in a particular language, it is available in English.
●Find support telephone numbers.
●Locate an HP service center.
Contacting support91  
						

							Labels
The labels affixed to the computer provide information you may need when you troubleshoot system 
problems or travel internationally with the computer.
IMPORTANT:All labels described in this section will be located in one of 3 places depending on your 
computer model: affixed to the bottom of the computer, located in the battery bay, or under the service door.
●Service label—Provides important information to identify your computer. When contacting support, 
you will probably be asked for the serial number, and possibly for the product number or the model 
number. Locate these numbers before you contact support.
Component(1)Serial number(2)Product number(3)Warranty period
●Microsoft® Certificate of Authenticity label (select models only prior to Windows 8)—Contains the 
Windows Product Key. You may need the Product Key to update or troubleshoot the operating system. 
HP platforms preinstalled with Windows 8 or Windows 8.1 do not have the physical label, but have a 
Digital Product Key electronically installed.
NOTE:This Digital Product Key is automatically recognized and activated by Microsoft Operating 
Systems on a reinstall of the Windows 8 or Windows 8.1 operating system with HP-approved recovery 
methods.
●Regulatory label(s)—Provide(s) regulatory information about the computer.
●Wireless certification label(s)—Provide(s) information about optional wireless devices and the approval 
markings of some of the countries or regions in which the devices have been approved for use. 
92Chapter 14   Support   
						

							15Specifications
●Input power
●Operating environment
Input power
The power information in this section may be helpful if you plan to travel internationally with the computer.
The computer operates on DC power, which can be supplied by an AC or a DC power source. The AC power 
source must be rated at 100–240 V, 50–60 Hz. Although the computer can be powered from a standalone DC 
power source, it should be powered only with an AC adapter or a DC power source supplied and approved by 
HP for use with this computer.
The computer can operate on DC power within the following specifications.
Input PowerRatingOperating voltage and current19.5 V dc @ 2.31 A – 45 W
19.5 V dc @ 3.33 A – 65 W
NOTE:This product is designed for IT power systems in Norway with phase-to-phase voltage not exceeding 
240 V rms.NOTE:The computer operating voltage and current can be found on the system regulatory label.
Operating environment
FactorMetricU.S.TemperatureOperating (writing to optical disc)5°C to 35°C41°F to 95°FNonoperating-20°C to 60°C-4°F to 140°FRelative humidity (noncondensing)Operating10% to 90%10% to 90%Nonoperating5% to 95%5% to 95%Maximum altitude (unpressurized)Operating-15 m to 3,048 m-50 ft to 10,000 ftNonoperating-15 m to 12,192 m-50 ft to 40,000 ftInput power93   
						

							ATraveling with or shipping your computer
If you have to travel with or ship your computer, here are some tips to keep in mind to keep your equipment 
safe.
●Prepare the computer for traveling or shipping:
◦Back up your information to an external drive.
◦Remove all discs and all external media cards, such as memory cards, from the computer.
◦Turn off and then disconnect all external devices.
◦Shut down the computer.
●Take along a backup of your information. Keep the backup separate on the computer.
●When traveling by air, carry the computer as hand luggage; do not check it in with the rest of your bags.
CAUTION:Avoid exposing a drive to magnetic fields. Security devices with magnetic fields include 
airport walk-through devices and security wands. Airport conveyer belts and similar security devices 
that check carry-on baggage use X-rays instead of magnetism and do not damage drives.
●If you plan to use the computer during a flight, listen for the in-flight announcement that tells you when 
you are allowed to use your computer. In-flight computer use is at the discretion of the airline.
●If you are shipping the computer or a drive, use suitable protective packaging and label the package 
“FRAGILE.”
If the computer has a wireless device installed, the use of these devices may be restricted in some 
environments. Such restrictions may apply aboard aircraft, in hospitals, near explosives, and in 
hazardous locations. If you are uncertain of the policy that applies to the use of a particular device, ask 
for authorization to use your computer before you turn it on.
●If you are traveling internationally, follow these suggestions:
◦Check the computer-related customs regulations for each country or region on your itinerary.
◦Check the power cord and adapter requirements for each location in which you plan to use the 
computer. Voltage, frequency, and plug configurations vary.
WARNING!To reduce the risk of electric shock, fire, or damage to the equipment, do not attempt 
to power the computer with a voltage converter kit sold for appliances.94Appendix A   Traveling with or shipping your computer   
						

							BTroubleshooting
Troubleshooting resources
●Access website links and additional information about the computer through Help and Support. To 
access Help and Support, select 
Start > Help and Support.
NOTE:Some checkup and repair tools require an Internet connection. HP also provides additional 
tools that do not require an Internet connection.
●Contact HP support. For U.S. support, go to http://www.hp.com/go/contactHP. For worldwide support, 
go to 
http://welcome.hp.com/country/us/en/wwcontact_us.html.
Choose from the following types of support:
◦Chat online with an HP technician.
NOTE:When chat is not available in a particular language, it is available in English.
◦Find HP support worldwide telephone numbers.
◦Locate an HP service center.
Resolving issues
The following sections describe several common issues and solutions.
The computer is unable to start up
If the computer does not turn on when you press the power button, the following suggestions may help you 
determine why the computer does not start up:
●If the computer is plugged into an AC outlet, plug another electrical device into the outlet to be sure that 
the outlet is providing adequate power.
NOTE:Use only the AC adapter provided with the computer or one approved by HP for this computer.
●If the computer is plugged into an external power source other than an AC outlet, plug the computer 
into an AC outlet using the AC adapter. Be sure that the power cord and AC adapter connections are 
secure.
The computer screen is blank
If the screen is blank but you have not turned off the computer, one or more of these settings may be the 
cause:
●The computer may be in the Sleep state. To exit Sleep, briefly press the power button. Sleep is an 
energy-saving feature that turns off the display. Sleep can be initiated by the system while the  computer is on but is not in use, or when the computer has reached a low battery level. To change these 
and other power settings, right-click the 
Battery icon on the Windows desktop in the notification area, 
at the far right of the taskbar, and then click 
Preferences.
●The computer may not be set to display the image on the computer screen. To transfer the image to the 
computer screen, press 
fn+f4. On most models, when an optional external display, such as a monitor, is 
Troubleshooting resources95    
						

							connected to the computer, the image can be displayed on the computer screen or the external display, 
or on both devices simultaneously. When you press 
fn+f4 repeatedly, the image alternates among the 
computer display, one or more external displays, and simultaneous display on all devices.
Software is functioning abnormally
If the software is unresponsive or responds abnormally, restart the computer. Click Start, click the arrow 
next to 
Shut down, and then select Restart. If you cannot restart the computer using this procedure, see the 
next section, 
The computer is on but not responding on page 96.
The computer is on but not responding
If the computer is turned on but is not responding to software or keyboard commands, try the following 
emergency shutdown procedures, in the sequence provided, until shutdown occurs:
CAUTION:Emergency shutdown procedures result in the loss of unsaved information.
●Press and hold the power button for at least 5 seconds.
●Disconnect the computer from external power and remove the battery.
The computer is unusually warm
It is normal for the computer to feel warm to the touch while it is in use. But if the computer feels unusually 
warm, it may be overheating because a vent is blocked.
If you suspect that the computer is overheating, allow the computer to cool to room temperature. Be sure to 
keep all vents free from obstructions while you are using the computer.
WARNING!To reduce the possibility of heat-related injuries or of overheating the computer, do not place 
the computer directly on your lap or obstruct the computer air vents. Use the computer only on a hard, flat 
surface. Do not allow another hard surface, such as an adjoining optional printer, or a soft surface, such as 
pillows or rugs or clothing, to block airflow. Also, do not allow the AC adapter to contact the skin or a soft 
surface, such as pillows or rugs or clothing, during operation. The computer and the AC adapter comply with 
the user-accessible surface temperature limits defined by the International Standard for Safety of 
Information Technology Equipment (IEC 60950).NOTE:The fan in the computer starts up automatically to cool internal components and prevent 
overheating. It is normal for the internal fan to cycle on and off during operation.
An external device is not working
Follow these suggestions if an external device does not function as expected:
●Turn on the device according to the manufacturer's instructions.
●Be sure that all device connections are secure.
●Be sure that the device is receiving electrical power.
●Be sure that the device, especially if it is older, is compatible with the operating system.
●Be sure that the correct drivers are installed and updated.
The wireless network connection is not working
If a wireless network connection is not working as expected, follow these suggestions:
96Appendix B   Troubleshooting    
						

							●To enable or disable a wireless or wired network device, right-click the Network Connection icon on the 
Windows desktop in the notification area, at the far right of the taskbar. To enable devices, select the 
check box from the menu option. To disable the device, clear the check box.
●Be sure that the wireless device is turned on.
●Be sure that the computer wireless antennas are free from obstructions.
●Be sure that the cable or DSL modem and its power cord are properly connected and that the lights are 
on.
●Be sure that the wireless router or access point is properly connected to its power adapter and to the 
cable or DSL modem, and that the lights are on.
●Disconnect and then reconnect all cables, and turn the power off and then back on.
A disc does not play
●Save your work and close all open programs before playing a CD or a DVD.
●Log off the Internet before playing a CD or a DVD.
●Be sure that you insert the disc properly.
●Be sure that the disc is clean. If necessary, clean the disc with filtered water and a lint-free cloth. Wipe 
from the center of the disc to the outer edge.
●Check the disc for scratches. If you find scratches, treat the disc with an optical disc repair kit available 
at many electronics stores.
●Disable Sleep mode before playing the disc.
Do not initiate Sleep while playing a disc. Otherwise, you may see a warning message asking if you want 
to continue. If this message is displayed, click 
No. After you click No, the computer may behave in either 
of the following ways:
◦Playback may resume.
– or –
◦The playback window in the multimedia program may close. To return to playing the disc, click the 
Play button in your multimedia program to restart the disc. In rare cases, you may need to exit the 
program and then restart it.
A movie is not visible on an external display
1.If both the computer display and an external display are turned on, press fn+f4 one or more times to 
switch between the 2 displays.
2.Configure the monitor settings to make the external display primary:
a.From the Windows desktop, right-click on a blank area of the computer desktop, and select Screen 
resolution
.
b.Specify a primary display and a secondary display.
NOTE:When using both displays, the DVD image will not appear on any display designated as the 
secondary display.Resolving issues97  
						

							The process of burning a disc does not begin, or it stops before completion
●Be sure that all other programs are closed.
●Turn off Sleep mode.
●Be sure that you are using the right kind of disc for your drive.
●Be sure that the disc is inserted properly.
●Select a slower write speed and try again.
●If you are copying a disc, save the information on the source disc to your hard drive before trying to burn 
the contents to a new disc, and then burn from your hard drive.
98Appendix B   Troubleshooting