HP ProDesk 405 G4 Service Guide
Maintenance and Service Guide
HP ProDesk 405 G4 Small Form Factor (SFF)
Business PC
© Copyright 2018, 2019 HP Development
Company, L.P.
AMD and Ryzen are trademarks of Advanced
Micro Devices, Inc. Bluetooth is a trademark
owned by its proprietor and used by HP Inc.
under license. Intel, Celeron, and Pentium are
trademarks of Intel Corporation in the U.S. and
other countries. Microsoft and Windows are
trademarks of the Microsoft group of
companies. DisplayPort and the DisplayPort logo
are trademarks owned by the Video Electronics
Standards Association (VESA®) in the United
States and 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.
Second Edition: December 2019
First Edition: June 2018
Document Part Number: L23140-002
Product notice
This guide describes features that are common
to most models. Some features may not be
available on your product. To access the latest
user guide, 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 device, do not place
the device directly on your lap or obstruct the device air vents. Use the device 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 contact the skin or a soft surface, such as pillows
or rugs or clothing, during operation. The device and the AC adapter comply with the user-accessible surface
temperature limits dened by applicable standards.
iii
iv Safety warning notice
Table of contents
1 Product features ....................................................................................................................................................................................... 1
Standard conguration features ............................................................................................................................................ 1
Front panel components ......................................................................................................................................................... 2
Rear panel components .......................................................................................................................................................... 3
Serial number location ............................................................................................................................................................. 3
2 Illustrated parts catalog ........................................................................................................................................................................... 4
Computer major components ................................................................................................................................................ 4
Cables and adapters ................................................................................................................................................................ 6
Drives .......................................................................................................................................................................................... 6
Mouse and keyboards .............................................................................................................................................................. 7
3 Routine care, SATA drive guidelines, and disassembly preparation ................................................................................................. 9
Electrostatic discharge information ...................................................................................................................................... 9
Generating static .................................................................................................................................................. 9
Preventing electrostatic damage to equipment ........................................................................................... 10
Personal grounding methods and equipment .............................................................................................. 10
Grounding the work area .................................................................................................................................. 10
Recommended materials and equipment ..................................................................................................... 11
Operating guidelines .............................................................................................................................................................. 11
Routine care ............................................................................................................................................................................ 12
General cleaning safety precautions .............................................................................................................. 12
Cleaning the computer case ............................................................................................................................ 12
Cleaning the keyboard ...................................................................................................................................... 12
Cleaning the monitor ........................................................................................................................................ 13
Cleaning the mouse .......................................................................................................................................... 13
Service considerations .......................................................................................................................................................... 13
Power supply fan ............................................................................................................................................... 13
Tools and software requirements .................................................................................................................. 13
Screws ................................................................................................................................................................. 14
Cables and connectors ..................................................................................................................................... 14
Hard Drives ......................................................................................................................................................... 14
Lithium coin cell battery ................................................................................................................................... 14
SATA hard drives ..................................................................................................................................................................... 15
SATA hard drive cables .......................................................................................................................................................... 15
SATA data cable .................................................................................................................................................. 15
v
SMART ATA drives ................................................................................................................................................................... 15
Cable management ............................................................................................................................................................... 16
4 Removal and replacement procedures .............................................................................................................................................. 17
Preparation for disassembly ................................................................................................................................................ 17
Access panel ........................................................................................................................................................................... 18
Front bezel .............................................................................................................................................................................. 19
Slim optical drive bezel blank .............................................................................................................................................. 20
Front bezel dust lter ............................................................................................................................................................ 21
Drive cage ................................................................................................................................................................................ 22
System board connections ................................................................................................................................................... 23
Memory .................................................................................................................................................................................... 24
Populating DIMM sockets ................................................................................................................................. 24
Removing and installing DIMMs ...................................................................................................................... 25
Expansion card ....................................................................................................................................................................... 27
Drives ....................................................................................................................................................................................... 31
Drive positions ................................................................................................................................................... 31
Installing and removing drives ........................................................................................................................ 31
Removing a 9.5 mm slim optical drive ...................................................................................... 32
Installing a 9.5 mm slim optical drive ........................................................................................ 33
Removing a 3.5 inch hard drive .................................................................................................. 34
Installing a 3.5 inch hard drive .................................................................................................... 35
Removing and installing an M.2 SSD storage card .................................................................. 38
Fan ............................................................................................................................................................................................ 40
Heat sink .................................................................................................................................................................................. 41
Processor ................................................................................................................................................................................. 42
WLAN module ......................................................................................................................................................................... 43
Power supply .......................................................................................................................................................................... 44
Option port board ................................................................................................................................................................... 46
Hood sensor ............................................................................................................................................................................ 47
Card reader .............................................................................................................................................................................. 48
Speaker .................................................................................................................................................................................... 49
Antennas ................................................................................................................................................................................. 50
System board .......................................................................................................................................................................... 53
System board callouts ...................................................................................................................................... 55
Changing from desktop to tower orientation .................................................................................................................... 56
5 Computer Setup (F10) Utility ................................................................................................................................................................ 57
Computer Setup (F10) Utilities ............................................................................................................................................ 57
Using Computer Setup (F10) Utilities ............................................................................................................. 57
Computer Setup–Main ...................................................................................................................................... 59
vi
Computer Setup—Security .............................................................................................................................. 61
Computer Setup—Advanced ........................................................................................................................... 64
Computer Setup—UEFI Drivers ...................................................................................................................... 69
Recovering the Conguration Settings ............................................................................................................................... 69
6 Troubleshooting without diagnostics ................................................................................................................................................. 70
Safety and comfort ................................................................................................................................................................ 70
Before you call for technical support .................................................................................................................................. 70
Helpful hints ............................................................................................................................................................................ 71
Solving general problems ..................................................................................................................................................... 72
Solving power problems ....................................................................................................................................................... 76
Solving hard drive problems ................................................................................................................................................ 77
Solving media card reader problems .................................................................................................................................. 79
Solving display problems ...................................................................................................................................................... 80
Solving audio problems ........................................................................................................................................................ 84
Solving printer problems ...................................................................................................................................................... 86
Solving keyboard and mouse problems ............................................................................................................................. 87
Solving hardware installation problems ............................................................................................................................. 88
Solving network problems .................................................................................................................................................... 89
Solving memory problems ................................................................................................................................................... 91
Solving CD-ROM and DVD problems ................................................................................................................................... 93
Solving USB ash drive problems ........................................................................................................................................ 95
Solving front panel component problems ......................................................................................................................... 96
Solving Internet access problems ....................................................................................................................................... 96
Solving software problems .................................................................................................................................................. 97
7 POST error messages and diagnostic front panel LEDs and audible codes ................................................................................. 98
POST numeric codes and text messages ........................................................................................................................... 98
Interpreting system validation diagnostic front panel LEDs and audible codes ....................................................... 103
8 Password security and resetting CMOS ............................................................................................................................................ 105
Resetting the password jumper ........................................................................................................................................ 105
Clearing and resetting the BIOS ........................................................................................................................................ 107
9 Using HP PC Hardware Diagnostics ................................................................................................................................................... 108
Using HP PC Hardware Diagnostics Windows (select products only) ......................................................................... 108
Downloading HP PC Hardware Diagnostics Windows ............................................................................... 108
Downloading the latest HP PC Hardware Diagnostics Windows version .......................... 108
Downloading HP Hardware Diagnostics Windows by product name or number
(select products only) ................................................................................................................ 109
vii
Installing HP PC Hardware Diagnostics Windows ...................................................................................... 109
Using HP PC Hardware Diagnostics UEFI ......................................................................................................................... 109
Starting HP PC Hardware Diagnostics UEFI ................................................................................................ 109
Downloading HP PC Hardware Diagnostics UEFI to a USB ash drive .................................................... 110
Downloading the latest HP PC Hardware Diagnostics UEFI version ................................... 110
Downloading HP PC Hardware Diagnostics UEFI by product name or number (select
products only) ............................................................................................................................. 110
Using Remote HP PC Hardware Diagnostics UEFI settings (select products only) ................................................... 110
Downloading Remote HP PC Hardware Diagnostics UEFI ........................................................................ 111
Downloading the latest Remote HP PC Hardware Diagnostics UEFI version ................... 111
Downloading Remote HP PC Hardware Diagnostics UEFI by product name or number 111
Customizing Remote HP PC Hardware Diagnostics UEFI settings .......................................................... 111
10 Backing up, restoring, and recovering ............................................................................................................................................ 112
Using Windows tools ........................................................................................................................................................... 112
Creating HP Recovery media (select products only) ...................................................................................................... 112
Using HP Recovery Manager to create recovery media ............................................................................ 113
Before you begin ........................................................................................................................ 113
Creating the recovery media ..................................................................................................... 113
Using the HP Cloud Recovery Download Tool to create recovery media ............................................... 113
Restoring and recovery ....................................................................................................................................................... 114
Restoring, resetting, and refreshing using Windows tools ...................................................................... 114
Restoring using HP Recovery Manager and the HP Recovery partition ................................................. 114
Recovering using HP Recovery Manager ..................................................................................................... 114
Recovering using the HP Recovery partition (select products only) ....................................................... 115
Recovering using HP Recovery media ......................................................................................................... 115
Changing the computer boot order ............................................................................................................. 116
Removing the HP Recovery partition (select products only) ................................................................... 116
Appendix A Battery replacement .......................................................................................................................................................... 117
Appendix B Power cord set requirements ........................................................................................................................................... 121
General requirements ......................................................................................................................................................... 121
Japanese power cord requirements ................................................................................................................................. 121
Country-specic requirements .......................................................................................................................................... 122
Appendix C Statement of memory volatility ....................................................................................................................................... 123
Nonvolatile memory usage ................................................................................................................................................ 125
Questions and answers ...................................................................................................................................................... 127
Using HP Sure Start (select models only) ........................................................................................................................ 128
viii
Appendix D Specications ...................................................................................................................................................................... 129
Index ........................................................................................................................................................................................................... 130
ix
x
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: This computer model can be used in a tower orientation or a desktop orientation.
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.
Front panel components
1 Slim optical drive (optional) 6 USB 2.0 port (fast charging port)
2 SD card reader (optional) 7 Audio-out (headphone)/Audio-in (microphone)
3 USB Type-C charging port 8 Hard drive activity light
combo jack
4 USB 3.1 Gen 1 ports (2) (5 Gbit/s data speed) 9 Power button
5 USB 2.0 port
NOTE: The audio-out (headphone)/audio-in (microphone) combo jack supports headphones, line output devices,
microphones, line input devices, or CTIA-style headsets.
NOTE: The USB port with HP Sleep and Charge provides current to charge a device such as a smart phone. The charging
current is available whenever the power cord is connected to the system, even when the system is o.
NOTE: The light on the power button is normally white when the power is on. If it is ashing red, there is a problem with
the computer, and it is displaying a diagnostic code. See Interpreting system validation diagnostic front panel LEDs and
audible codes on page 103 to interpret the code.
2 Chapter 1 Product features
Rear panel components
Rear panel components
1 Audio-in jack 6 Optional port
2 Serial port (optional) 7 USB 2.0 ports with wake from S4 (2)
3 RJ-45 (network) jack 8 USB 3.1 Gen 1 (2) (5 Gbit/s data speed)
4 Audio-out jack for powered audio devices 9 USB 2.0 (2)
5 DisplayPort™ monitor connectors (2) 10 Power cord connector
NOTE: Your model may have additional optional ports available from HP.
When a graphics card is installed in one of the system board slots, the video connectors on the graphics card and/or the integrated
graphics on the system board may be used. The specic graphics card installed and software conguration will determine
the behavior.
The system board graphics can be disabled by changing settings in BIOS F10 Setup.
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 customer service for assistance.
Rear panel components 3
2 Illustrated parts catalog
Computer major components
Item Description
(1) System board for use with Ryzen™ PRO processors (includes replacement thermal material)
(2) Front bezel
(3) Dust lter
(4) Access panel
(5) Power supply (180 W)
(6) Heat sink (includes replacement thermal material)
(7) Fan
(8) Processor
AMD Ryzen 5 PRO 2400G
AMD Ryzen 3 PRO 2200G
(9) Memory modules (UDIMM, PC4-2666, NECC)
16 GB
8 GB
4 Chapter 2 Illustrated parts catalog
Item Description
4 GB
(10) Speaker
(11) Hood sensor
(12) WLAN modules
Intel® 3168 802.11 AC 1x1 with Bluetooth® 4.0 (Brazil)
Intel 7265 802.11AC 2x2 with Bluetooth M.2 Combo Card non-vPro (Brazil)
Intel 9260 802.11 AC 2x2 +Bluetooth 5 PCIe non-vPro
Realtek 802.11 AC 1x1 with Bluetooth 4.2 LE M.2 PCIe
Realtek 802.11 AC 2x2 with Bluetooth 4.2 LE M.2 PCIe
(13) AMD™ Radeon R7 430 2 GB FH PCIe x16 G5 graphics card (select models only)
(14) Serial+PS/2 port (select models only)
(15) Antenna cover
(16) Bezel blank for optical drive slot
(17) Optical drive latch
* Option boards:
HDMI option board
DisplayPort option board
VGA option board
USB Type-C option board
* Parallel port, PCIe card
* 2nd serial port
* Card reader assembly
* Stand
* Power cord
* Optical drive bezel
* HP USB Type-C to USB Type-A hub
* Fan duct
Computer major components 5
Cables and adapters
Item Description
(1) SATA drive power cable
(2) SATA data cable, 5.7 inch, 2 straight ends
SATA data cable, 7.5 inch, 2 straight ends
* DVI cable, 1.8 m
Drives
* Internal wireless antennas
* Antenna cover
* Adapters
DisplayPort to HDMI 2.0
DisplayPort to VGA
DisplayPort to DVI
USB to serial
USB Type-C to USB 3.0
USB 3.1 Type-C to DisplayPort
Description
Hard drives (3.5 inch)
2 TB, 7200 rpm
1 TB, 7200 rpm
500 GB, 7200 rpm hard drive, self-encrypting (SED), Opal 2, 7 mm
500 GB, 7200 rpm
Solid-state drives:
6 Chapter 2 Illustrated parts catalog
Description
1 TB, M.2 2280, NVMe, TLC, SS
512 GB, M2 2280, PCIe, NVMe, TLC, SS
512 GB, M.2 2280, PCIe, NVMe, value
512 GB, M.2 2280, PCIe 3×4, TLC, SED
512 GB, SATA3, TLC
512 GB, SATA3 TLC, SED Opal2
256 GB, M2 2280, PCIe, NVMe, TLC, SS
256 GB, M.2 2280, PCIe, NVMe, value
256 GB, M.2 2280, PCIe 3×4, TLC, SED
256 GB, SATA3, TLC
256 GB, SATA3 TLC, SED Opal2
128 GB, M2 2280, PCIe, NVMe, TLC
Optical drives, 9.5 mm
BD Blu-ray writer drive
DVD±RW drive
DVD-ROM drive
Mouse and keyboards
Description
Mouse
USB, healthcare, wired
USB, antimicrobial
USB/PS2 Washable
USB, Hardened
USB, optical
PS/2, optical
USB, laser
HP USB Premium
USB/PS2 washable
Keyboards
Washable, USB PS2
USB, unbranded
USB
Mouse and keyboards 7
Description
USB, essential
Conferencing
USB, slim
Wireless, with mouse
USB, slim, smartcard
Antimicrobial
USB, slim, gray
USB, collaboration
Wireless, collaboration
USB, wired, healthcare
Premium, wireless
USB, Katydid
8 Chapter 2 Illustrated parts catalog
3 Routine care, SATA drive guidelines, and
disassembly preparation
This chapter provides general service information for the computer. Adherence to the procedures and
precautions described in this chapter is essential for proper service.
IMPORTANT: 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
system board or component damage.
Electrostatic discharge information
A sudden discharge of static electricity from your nger or other conductor can destroy static-sensitive devices
or microcircuitry. Often the spark is neither felt nor heard, but damage occurs. An electronic device exposed to
electrostatic discharge (ESD) may not appear to be aected at all and can work perfectly throughout a normal
cycle. The device may function normally for a while, but it has been degraded in the internal layers, reducing its
life expectancy.
Networks built into many integrated circuits provide some protection, but in many cases, the discharge contains
enough power to alter device parameters or melt silicon junctions.
Generating static
The following table shows that:
● Dierent activities generate dierent amounts of static electricity.
● Static electricity increases as humidity decreases.
Relative Humidity
Event 55% 40% 10%
Walking across carpet
Walking across vinyl oor
Motions of bench worker
Removing DIPs from plastic tube
Removing DIPs from vinyl tray
Removing DIPs from polystyrene foam
Removing bubble pack from PCB
Packing PCBs in foam-lined box
These are then multi-packaged inside plastic tubes, trays, or polystyrene foam.
7,500 V
3,000 V
400 V
400 V
2,000 V
3,500 V
7,000 V
5,000 V
15,000 V
5,000 V
800 V
700 V
4,000 V
5,000 V
20,000 V
11,000 V
35,000 V
12,000 V
6,000 V
2,000 V
11,500 V
14,500 V
26,500 V
21,000 V
NOTE: 700 volts can degrade a product.
Electrostatic discharge information 9
Preventing electrostatic damage to equipment
Many electronic components are sensitive to ESD. Circuitry design and structure determine the degree of
sensitivity. The following packaging and grounding precautions are necessary to prevent damage to electric
components and accessories.
● To avoid hand contact, transport products in static-safe containers such as tubes, bags, or boxes.
● Protect all electrostatic parts and assemblies with conductive or approved containers or packaging.
● Keep electrostatic sensitive parts in their containers until they arrive at static-free stations.
● Place items on a grounded surface before removing them from their container.
● Always be properly grounded when touching a sensitive component or assembly.
● Avoid contact with pins, leads, or circuitry.
● Place reusable electrostatic-sensitive parts from assemblies in protective packaging or conductive foam.
Personal grounding methods and equipment
Use the following equipment to prevent static electricity damage to equipment:
● Wrist straps are exible straps with a maximum of 1 MΩ ± 10% resistance in the ground cords. To provide
proper ground, a strap must be worn snug against bare skin. The ground cord must be connected and t
snugly into the banana plug connector on the grounding mat or workstation.
● Heel straps, toe straps, boot straps can be used at standing workstations and are compatible with most
types of shoes or boots. On conductive oors or dissipative oor mats, use them on both feet with a
maximum of 1 MΩ ± 10% resistance between the operator and ground.
Static Shielding Protection Levels
Method Voltage
Antistatic plastic
Carbon-loaded plastic
Metallized laminate
Grounding the work area
To prevent static damage at the work area, use the following precautions:
● Cover the work surface with approved static-dissipative material. Provide a wrist strap connected to
the work surface and properly grounded tools and equipment.
● Use static-dissipative mats, foot straps, or air ionizers to give added protection.
● Handle electrostatic sensitive components, parts, and assemblies by the case or PCB laminate. Handle
them only at static-free work areas.
● Turn o power and input signals before inserting and removing connectors or test equipment.
● Use xtures made of static-safe materials when xtures must directly contact dissipative surfaces.
● Keep work area free of nonconductive materials such as ordinary plastic assembly aids and polystyrene
foam.
1,500
7,500
15,000
● Use eld service tools, such as cutters, screwdrivers, and vacuums, that are conductive.
10 Chapter 3 Routine care, SATA drive guidelines, and disassembly preparation
Recommended materials and equipment
Materials and equipment that are recommended for use in preventing static electricity include:
● Antistatic tape
● Antistatic smocks, aprons, or sleeve protectors
● Conductive bins and other assembly or soldering aids
● Conductive foam
●
Conductive tabletop workstations with ground cord of 1 MΩ +/- 10% resistance
● Static-dissipative table or oor mats with hard tie to ground
● Field service kits
● Static awareness labels
● Wrist straps and footwear straps providing 1 MΩ +/- 10% resistance
● Material handling packages
● Conductive plastic bags
● Conductive plastic tubes
● Conductive tote boxes
● Opaque shielding bags
● Transparent metallized shielding bags
● Transparent shielding tubes
Operating guidelines
To prevent overheating and to help prolong the life of the computer:
● Keep the computer away from excessive moisture, direct sunlight, and extremes of heat and cold.
● Operate the computer on a sturdy, level surface. Leave a 10.2 cm (4 inch) clearance on all vented sides of
the computer and above the monitor to permit the required airow.
● Never restrict the airow into the computer by blocking any vents or air intakes. Do not place the keyboard,
with the keyboard feet down, directly against the front of the desktop unit as this also restricts airow.
● Occasionally clean the air vents on all vented sides of the computer. Lint, dust, and other foreign matter can
block the vents and limit the airow. Be sure to unplug the computer before cleaning the air vents.
● Never operate the computer with the cover or side panel removed.
● Do not stack computers on top of each other or place computers so near each other that they are subject
to each other’s recirculated or preheated air.
● If the computer is to be operated within a separate enclosure, intake and exhaust ventilation must be
provided on the enclosure, and the same operating guidelines listed above will still apply.
● Keep liquids away from the computer and keyboard.
● Never cover the ventilation slots on the monitor with any type of material.
● Install or enable power management functions of the operating system or other software, including
sleep states.
Operating guidelines 11
Routine care
General cleaning safety precautions
1. Never use solvents or ammable solutions to clean the computer.
2. Never immerse any parts in water or cleaning solutions; apply any liquids to a clean cloth and then use
the cloth on the component.
3. Always unplug the computer when cleaning with liquids or damp cloths.
4. Always unplug the computer before cleaning the keyboard, mouse, or air vents.
5. Disconnect the keyboard before cleaning it.
6. Wear safety glasses equipped with side shields when cleaning the keyboard.
Cleaning the computer case
Follow all safety precautions in General cleaning safety precautions on page 12 before cleaning the computer.
To clean the computer case, use the following procedures:
● To remove light stains or dirt, use plain water with a clean, lint-free cloth or swab.
● For stronger stains, use a mild dishwashing liquid diluted with water. Rinse well by wiping it with a cloth or
swab dampened with clear water.
● For stubborn stains, use isopropyl (rubbing) alcohol. No rinsing is needed because the alcohol will
evaporate quickly and not leave a residue.
● After cleaning, always wipe the unit with a clean, lint-free cloth.
● Occasionally clean the air vents on the computer. Lint and other foreign matter can block the vents and
limit the airow.
Cleaning the keyboard
Follow all safety precautions in General cleaning safety precautions on page 12 before cleaning the keyboard.
To clean the tops of the keys or the keyboard body, follow the procedures described in Cleaning the computer
case on page 12.
When cleaning debris from under the keys, review all rules in General cleaning safety precautions on page 12
before following these procedures:
CAUTION: Use safety glasses equipped with side shields before attempting to clean debris from under
the keys.
● Visible debris underneath or between the keys may be removed by vacuuming or shaking.
● Canned, pressurized air may be used to clean debris from under the keys. Caution should be used as too
much air pressure can dislodge lubricants applied under the wide keys.
● If you remove a key, use a specially designed key puller to prevent damage to the keys. This tool is
available through many electronic supply outlets.
12 Chapter 3 Routine care, SATA drive guidelines, and disassembly preparation
IMPORTANT: Never remove a wide leveled key (like the space bar) from the keyboard. If these keys are
improperly removed or installed, the keyboard may not function properly.
● Cleaning under a key may be done with a swab moistened with isopropyl alcohol and squeezed out. Be
careful not to wipe away lubricants necessary for proper key functions. Use tweezers to remove any bers
or dirt in conned areas. Allow the parts to air dry before reassembly.
Cleaning the monitor
● Wipe the monitor screen with a clean cloth moistened with water or with a towelette designed for cleaning
monitors. Do not use sprays or aerosols directly on the screen; the liquid may seep into the housing and
damage a component. Never use solvents or
● To clean the monitor body follow the procedures in Cleaning the computer case on page 12.
Cleaning the mouse
Before cleaning the mouse, ensure that the power to the computer is turned o.
● Clean the mouse ball by rst removing the retaining plate and the ball from the housing. Pull out any debris
from the ball socket and wipe the ball with a clean, dry cloth before reassembly.
● To clean the mouse body, follow the procedures in Cleaning the computer case on page 12.
Service considerations
ammable liquids on the monitor.
Keep the following considerations in mind during the disassembly and assembly of the computer.
Power supply fan
The power supply fan is a variable-speed fan based on the temperature in the power supply.
IMPORTANT: The cooling fan is always on when the computer is in the “On” mode. The cooling fan is o when
the computer is in “Standby,” “Suspend,” or “O” modes.
You must disconnect the power cord from the power source before opening the computer to prevent system
board or component damage.
Tools and software requirements
To service the computer, you need the following:
● Torx T-15 screwdriver
● Flat-blade screwdriver (may sometimes be used in place of the Torx screwdriver)
● Phillips #1 screwdriver
Service considerations 13
Screws
The screws used in the computer are not interchangeable. They may have standard or metric threads and may
be of dierent lengths. If an incorrect screw is used during the reassembly process, it can damage the unit. HP
strongly recommends that all screws removed during disassembly be kept with the part that was removed, then
returned to their proper locations.
IMPORTANT: Metric screws have a black nish. U.S. screws have a silver nish and are used on hard drives only.
IMPORTANT: As each subassembly is removed from the computer, it should be placed away from the work area
to prevent damage.
Cables and connectors
Most cables used throughout the unit are at, exible cables. These cables must be handled with care to avoid
damage. Apply only the tension required to seat or unseat the cables during insertion or removal from
the connector. Handle cables by the connector whenever possible. In all cases, avoid bending or twisting
the cables, and ensure that the cables are routed in such a way that they cannot be caught or snagged by parts
being removed or replaced.
IMPORTANT: When servicing this computer, be sure that cables are placed in their proper location during
the reassembly process. Improper cable placement can damage the computer.
Hard Drives
Handle hard drives as delicate, precision components, avoiding all physical shock and vibration. This applies to
failed drives as well as replacement spares.
● If a drive must be mailed, place the drive in a bubble-pack mailer or other suitable protective packaging and
label the package “Fragile: Handle With Care.”
● Do not remove hard drives from the shipping package for storage. Keep hard drives in their protective
packaging until they are actually mounted in the computer.
● Avoid dropping drives from any height onto any surface.
● If you are inserting or removing a hard drive, turn o the computer. Do not remove a hard drive while
the computer is on or in standby mode.
● Before handling a drive, ensure that you are discharged of static electricity. While handling a drive, avoid
touching the connector.
● Do not use excessive force when inserting a drive.
● Avoid exposing a hard drive to liquids, temperature extremes, or products that have magnetic elds such
as monitors or speakers.
Lithium coin cell battery
The battery that comes with the computer provides power to the real-time clock and has a minimum lifetime of
about three years.
See the appropriate removal and replacement chapter for the chassis you are working on in this guide for
instructions on the replacement procedures.
WARNING! This computer contains a lithium battery. There is a risk of re and chemical burn if the battery is
handled improperly. Do not disassemble, crush, puncture, short external contacts, dispose in water or re, or
expose it to temperatures higher than 60ºC (140ºF). Do not attempt to recharge the battery.
14 Chapter 3 Routine care, SATA drive guidelines, and disassembly preparation
NOTE: Do not dispose of batteries, battery packs, and accumulators together with general household waste. To
forward them to recycling or proper disposal, please use the public collection system or return them to HP, their
authorized partners, or their agents.
SATA hard drives
Serial ATA Hard Drive Characteristics
Number of pins/conductors in data cable 7/7
Number of pins in power cable 15
Maximum data cable length 39.37 in (100 cm)
Data interface voltage dierential 400 mV – 700 mV
Drive voltages 3.3 V, 5 V, 12 V
Jumpers for conguring drive N/A
Data transfer rate 6.0 GB/s
SATA hard drive cables
SATA data cable
Always use an HP approved SATA 6.0 Gb/s cable as it is fully backwards compatible with the SATA 1.5 Gb/s drives.
Current HP desktop products ship with SATA 6.0 Gb/s hard drives.
SATA data cables are susceptible to damage if overexed. Never crease a SATA data cable and never bend it
tighter than a 30 mm (1.18 in) radius.
The SATA data cable is a thin, 7-pin cable designed to transmit data for only a single drive.
SMART ATA drives
The Self Monitoring Analysis and Recording Technology (SMART) ATA drives for the HP Personal Computers have
built-in drive failure prediction that warns the user or network administrator of an impending failure or crash of
the hard drive. The SMART drive tracks fault prediction and failure indication parameters such as reallocated
sector count, spin retry count, and calibration retry count. If the drive determines that a failure is imminent, it
generates a fault alert.
SATA hard drives 15
Cable management
Always follow good cable management practices when working inside the computer.
● Keep cables away from major heat sources like the heat sink.
● Do not jam cables on top of expansion cards or memory modules. Printed circuit cards like these are not
designed to take excessive pressure on them.
● Keep cables clear of sliding or moveable parts to prevent them from being cut or crimped when the parts
are moved.
● When folding a at ribbon cable, never fold to a sharp crease. Sharp creases may damage the wires.
● Some at ribbon cables come prefolded. Never change the folds on these cables.
● Do not bend any cable sharply. A sharp bend can break the internal wires.
● Never bend a SATA data cable tighter than a 30 mm (1.18 in) radius.
● Never crease a SATA data cable.
● Do not rely on components like the drive cage, power supply, or computer cover to push cables down into
the chassis. Always position the cables to lay properly by themselves.
16 Chapter 3 Routine care, SATA drive guidelines, and disassembly preparation
4 Removal and replacement procedures
Adherence to the procedures and precautions described in this chapter is essential for proper service. After
completing all necessary removal and replacement procedures, run the Diagnostics utility to verify that all
components operate properly.
NOTE: Not all features listed in this guide are available on all computers.
Preparation for disassembly
See Routine care, SATA drive guidelines, and disassembly preparation on page 9 for initial safety procedures.
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 turn o any external devices.
4. Disconnect the power cord from the AC outlet and disconnect any external devices.
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. To prevent damage to internal components, you must
disconnect the power cord from the power source before opening the computer.
5. If the computer is on a stand, remove the computer from the stand and lay the computer down.
Preparation for disassembly 17
Access panel
1. Prepare the computer for disassembly (Preparation for disassembly on page 17).
2. Slide the access panel release lever to the right (1) so that it locks into place. Then slide the access panel
back (2) and lift it o the computer (3).
To install the access panel, reverse the removal procedure.
18 Chapter 4 Removal and replacement procedures
Front bezel
1. Prepare the computer for disassembly (Preparation for disassembly on page 17).
2. Remove the access panel (Access panel on page 18).
3. Lift up the four tabs on the top of the bezel (1), and then rotate the bezel o the chassis (2).
To install the front bezel, reverse the removal procedure.
Front bezel 19
Slim optical drive bezel blank
On some models, there is a bezel blank covering the slim optical drive bay. Remove the bezel blank before
installing an optical drive. To remove the bezel blank:
1. Prepare the computer for disassembly (Preparation for disassembly on page 17).
2. Remove the access panel (Access panel on page 18).
3. Remove the front bezel (Front bezel on page 19).
4. Press inward on the tab on the left side of the blank (1), and then rotate the blank o the front bezel (2).
NOTE: After removing the slim optical drive bezel blank and installing a slim optical drive, you can install an
optional bezel trim piece (available from HP) that surrounds the front of the slim optical drive.
20 Chapter 4 Removal and replacement procedures
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