Hewlett Packard 7EL74ET User Manual
Hardware Reference Guide
© Copyright 2018, 2019 HP Development
Company, L.P.
Windows is either a registered trademark or
trademark of Microsoft Corporation in the
United States and/or other countries.
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.
Third Edition: June 2019
First Edition: May 2018
Document Part Number: L18074-003
Product notice
This user guide describes features that are
common to most models. Some features may
not be available on your computer.
Not all features are available in all editions or
versions of Windows. Systems may require
upgraded and/or separately purchased
hardware, drivers, software or BIOS update to
take full advantage of Windows functionality.
Windows 10 is automatically updated, which is
always enabled. ISP fees may apply and
additional requirements may apply over time
for updates. See http://www.microsoft.com.
To access the latest user guides, go to
http://www.hp.com/support and follow the
instructions to nd your product. Then select
User Guides.
Software terms
By installing, copying, downloading, or
otherwise using any software product
preinstalled on this computer, you agree to be
bound by the terms of the HP End User License
Agreement (EULA). If you do not accept these
license terms, your sole remedy is to return the
entire unused product (hardware and software)
within 14 days for a full refund subject to the
refund policy of your seller.
For any further information or to request a full
refund of the price of the computer, please
contact your seller.
Safety warning notice
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, at
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 airow. Also, do not allow the AC adapter to come into contact with 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 dened by the International Standard for Safety
of Information Technology Equipment (IEC 60950-1).
iii
iv Safety warning notice
About This Guide
This guide provides basic information for upgrading the HP ProDesk Business PC.
WARNING! Indicates a hazardous situation that, if not avoided, could result in serious injury or death.
CAUTION: Indicates a hazardous situation that, if not avoided, could result in minor or moderate injury.
IMPORTANT: Indicates information considered important but not hazard-related (for example, messages
related to property damage). Warns the user that failure to follow a procedure exactly as described could
result in loss of data or in damage to hardware or software. Also contains essential information to explain a
concept or to complete a task.
NOTE: Contains additional information to emphasize or supplement important points of the main text.
TIP: Provides helpful hints for completing a task.
v
vi About This Guide
Table of contents
1 Product features ........................................................................................................................................... 1
Standard conguration features ........................................................................................................................... 1
Front panel components ....................................................................................................................................... 2
Rear panel components ......................................................................................................................................... 4
Serial number location .......................................................................................................................................... 5
2 Hardware upgrades ....................................................................................................................................... 6
Serviceability features ........................................................................................................................................... 6
Warnings and cautions .......................................................................................................................................... 6
Preparing for disassembly ..................................................................................................................................... 6
Removing the computer access panel ................................................................................................................... 8
Replacing the computer access panel ................................................................................................................... 9
Removing the front bezel .................................................................................................................................... 10
Removing an optical drive bezel blank ............................................................................................................... 11
Replacing the front bezel .................................................................................................................................... 12
System board connectors .................................................................................................................................... 13
Upgrading system memory ................................................................................................................................. 14
Installing a memory module ............................................................................................................. 14
Removing or installing an expansion card .......................................................................................................... 16
Drive positions ..................................................................................................................................................... 21
Removing and installing drives ........................................................................................................................... 22
Removing a 9.5 mm slim optical drive .............................................................................................. 22
Installing a 9.5 mm slim optical drive ............................................................................................... 24
Removing a 3.5-inch hard drive ........................................................................................................ 26
Installing a 3.5-inch hard drive ......................................................................................................... 27
Removing a 2.5-inch hard drive ........................................................................................................ 28
Installing a 2.5-inch hard drive ......................................................................................................... 29
Installing a security lock ...................................................................................................................................... 31
Security cable lock ............................................................................................................................. 31
Padlock .............................................................................................................................................. 32
HP Business PC Security Lock V2 ...................................................................................................... 32
Appendix A Battery replacement ..................................................................................................................... 38
Appendix B Electrostatic discharge .................................................................................................................. 42
Preventing electrostatic damage ........................................................................................................................ 42
vii
Grounding methods ............................................................................................................................................. 42
Appendix C Computer operating guidelines, routine care and shipping preparation ............................................. 43
Computer operating guidelines and routine care ............................................................................................... 43
Optical drive precautions ..................................................................................................................................... 44
Operation ........................................................................................................................................... 44
Cleaning ............................................................................................................................................. 44
Safety ................................................................................................................................................ 44
Shipping preparation ........................................................................................................................................... 44
Appendix D Accessibility ................................................................................................................................. 45
Supported assistive technologies ....................................................................................................................... 45
Contacting support .............................................................................................................................................. 45
Index ............................................................................................................................................................. 46
viii
1 Product features
Standard conguration features
Features may vary depending on the model. For support assistance and to learn more about the hardware
and software installed on your computer model, run the HP Support Assistant utility.
NOTE: Refer to the illustration that most closely matches your computer.
Standard conguration features 1
Front panel components
Drive conguration may vary by model. Some models have a bezel blank covering the slim optical drive bay.
NOTE: Refer to the illustration that most closely matches your computer.
Table 1-1 Front panel components
Component Component
1 Slim optical drive (optional) 4 Audio-out (headphone)/Audio-in (microphone) combo
jack*
2 Dual-state power button 5 USB SuperSpeed ports (2)**
3 Hard drive activity light 6 Memory card reader
* When a device is plugged into the combo jack, a dialog box is displayed. Select the type of device that is connected.
** This port connects a USB device, provides high-speed data transfer, and even when the computer is o, charges products
such as a cell phone, camera, activity tracker, or smartwatch.
2 Chapter 1 Product features
Table 1-2 Front panel components
Component Component
1 Slim optical drive (optional) 5 USB port with HP Sleep and Charge
2 Dual-state power button 6 USB port
3 Hard drive activity light 7 USB SuperSpeed ports (2)**
4 Audio-out (headphone)/Audio-in (microphone) combo
jack*
* When a device is plugged into the combo jack, a dialog box is displayed. Select the type of device that is connected.
** This port connects a USB device, provides high-speed data transfer, and even when the computer is o, charges products
such as a cell phone, camera, activity tracker, or smartwatch.
8 Memory card reader
Front panel components 3
Rear panel components
Table 1-3 Rear panel components
Component Component
1 Audio-out jack for powered audio devices 6 Audio-in jack
2 DisplayPort monitor connector 7 RJ-45 (network) jack
3 VGA monitor connector 8 Serial port connector
4 USB SuperSpeed ports (2 or 4, depending on
product)
5 USB 2.0 ports (4)
NOTE: An optional second serial port and an optional parallel port are available from HP.
If using a USB keyboard, HP recommends connecting the keyboard to one of the USB 2.0 ports with the Wake from S4/S5
feature. The Wake from S4/S5 feature is also supported on the PS/2 connectors if enabled in BIOS F10 Setup.
When a graphics card is installed in one of the system board slots, the video connectors on the graphics card and the
integrated graphics on the system board may be used at the same time. However, for such a conguration, only the display
connected to the discrete graphics card will display POST messages.
The system board graphics can be disabled by changing settings in Computer Setup.
9 Power cord connector
4 Chapter 1 Product features
Serial number location
Each computer has a unique serial number and a product ID number that are located on the exterior of the
computer. Keep these numbers available for use when contacting support for assistance.
Serial number location 5
2 Hardware upgrades
Serviceability features
The computer includes features that make it easy to upgrade and service. A Torx T15 or at-bladed
screwdriver is needed for many of the installation procedures described in this chapter.
Warnings and cautions
Before performing upgrades be sure to carefully read all of the applicable instructions, cautions, and
warnings in this guide.
WARNING! To reduce the risk of personal injury from electrical shock, hot surfaces, or re:
Disconnect the power cord from the AC outlet and allow the internal system components to cool before you
touch them.
Do not plug telecommunications or telephone connectors into the network interface controller (NIC)
receptacles.
Do not disable the power cord grounding plug. The grounding plug is an important safety feature.
Plug the power cord into a grounded (earthed) outlet that is easily accessible at all times.
To reduce the risk of serious injury, read the Safety & Comfort Guide. It describes proper workstation setup,
and proper posture, health, and work habits for computer users. The
important electrical and mechanical safety information. The Safety & Comfort Guide is available on the Web
at http://www.hp.com/ergo.
WARNING! Energized and moving parts inside.
Disconnect power to the equipment before removing the enclosure.
Replace and secure the enclosure before re-energizing the equipment.
IMPORTANT: Static electricity can damage the electrical components of the computer or optional
equipment. Before beginning these procedures, ensure that you are discharged of static electricity by briey
touching a grounded metal object. See Electrostatic discharge on page 42 for more information.
When the computer is plugged into an AC power source, voltage is always applied to the system board. You
must disconnect the power cord from the power source before opening the computer to prevent damage to
internal components.
Preparing for disassembly
1. Remove/disengage any security devices that prohibit opening the computer.
2. Remove all removable media, such as compact discs or USB ash drives, from the computer.
3. Turn o the computer properly through the operating system, and then turn o any external devices.
4. Disconnect the power cord from the power outlet and disconnect any external devices.
Safety & Comfort Guide also provides
6 Chapter 2 Hardware upgrades
IMPORTANT: Regardless of the power-on state, voltage is always present on the system board as long
as the system is plugged into an active AC outlet. You must disconnect the power cord to avoid damage
to the internal components of the computer.
Preparing for disassembly 7
Removing the computer access panel
1. Prepare the computer for disassembly. See Preparing for disassembly on page 6.
2. Loosen the thumbscrew (1) on the rear of the computer and then slide the panel back (2) and lift if o
the computer (3).
8 Chapter 2 Hardware upgrades
Replacing the computer access panel
Place the panel on the computer (1), slide it forward (2), and then tighten the thumbscrew (3) to secure the
panel in place.
Replacing the computer access panel 9
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