HP ProDesk 400 G4 Base Model Desktop Mini PC User Manual

Maintenance and Service GuideHP ProDesk 400 G4 Desktop Mini

Rear panel componentsNOTE: Your computer model may look slightly dierent from the illustration in this section.Item Icon Component Item Icon Componen

Using Remote HP PC Hardware Diagnostics UEFI settings (select products only)Remote HP PC Hardware Diagnostics UEFI is a rmware (BIOS) feature that do

3. Make your customization selections.4. Select Main, and then Save Changes and Exit to save your settings.Your changes take eect when the computer r

A Power Cord Set RequirementsThe power supplies on some computers have external power switches. The voltage select switch feature on the computer perm

Country-Specic RequirementsAdditional requirements specic to a country are shown in parentheses and explained below.Country Accrediting Agency Cou

B Statement of memory volatilityThe purpose of this chapter is to provide general information regarding nonvolatile memory in HP Business computers. T

g. If a DriveLock password is set, select the Security menu, and scroll down to Hard Drive Utilities under the Utilities menu. Select Hard Drive Utili

Nonvolatile memory usageNonvolatile Memory Type Amount (Size)Does this memory store customer data?Does this memory retain data when power is removed?W

Nonvolatile Memory Type Amount (Size)Does this memory store customer data?Does this memory retain data when power is removed?What is the purpose of th

Questions and answers1. How can the BIOS settings be restored (returned to factory settings)?IMPORTANT: Restore defaults does not securely erase any d

IMPORTANT: Resetting will result in the loss of information.These steps will not reset Custom Secure Boot Keys. See question and answer 7 for informat

2 Illustrated parts catalogNOTE: HP continually improves and changes product parts. For complete and current information on supported parts for your c

C Specications U.S. MetricDimensions Height 6.9 in 175 mmWidth 7.0 in 177 mmDepth 1.3 in 34 mmApproximate Weight 3.9 lb 1.77 kgTemperature Range

IndexAaccess panelillustrated 3locked 57removal 16administrator password 86antenna connector, external 2antenna cover 2audible codes 84audio problems

headphone 1RJ-45 (network) 2Kkeyboardcleaning 11keyboard problems 69LLED, main storage 1Mmain storage LED 1media card readerproblems 62memorynonvolati

system boardillustrated 5removal and replacement 35SATA connectors 13system memory, removing personal data from volatile 96Ttemperature control 10thum

Item Description VGA option board Serial port option board USB Type-C option board(7) Solid-state drives, NVMe, M.2 2280/2230, PCIe 512-GB, TLC 5

Item Description Realtek RTL8822BE 802.11ac 2x2 with Bluetooth® M.2 Combo Card Realtek RTL8821CE 802.11ac 1x1 with Bluetooth® M.2 Combo Card Intel

DescriptionPC mounting bracket, B300Antenna coverPort coverHP USB-Type C to USB Type-A HubDisplayPort cableDVI monitor cableAdaptersUSB Type-C to USB

DescriptionUSB, hardenedPower cordMiscellaneous parts 7

3 Routine care, SATA drive guidelines, and disassembly preparationThis chapter provides general service information for the computer. Adherence to the

Preventing electrostatic damage to equipmentMany electronic components are sensitive to ESD. Circuitry design and structure determine the degree of se

Recommended materials and equipmentMaterials and equipment that are recommended for use in preventing static electricity include:●Antistatic tape●Anti

●Never cover the ventilation slots on the monitor with any type of material.●Install or enable power management functions of the operating system or o

© Copyright 2018 HP Development Company, L.P.AMD is a trademark of Advanced Micro Devices, Inc. Bluetooth is a trademark owned by its proprietor and u

●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

Hard DrivesHandle hard drives as delicate, precision components, avoiding all physical shock and vibration. This applies to failed drives as well as r

4 Removal and replacement proceduresAdherence to the procedures and precautions described in this chapter is essential for proper service. After compl

Preparation for disassemblySee Routine care, SATA drive guidelines, and disassembly preparation on page 8 for initial safety procedures.1. Remove/dise

Access panelTo access internal components, you must remove the access panel:1. Prepare the computer for disassembly (Preparation for disassembly on pa

Front bezelNOTE: It is not necessary to remove the front bezel to access other components.The front bezel is secured to the top cover by screws.1. Pre

Hood sensorThe hood sensor is located near the front of the computer.1. Prepare the computer for disassembly (Preparation for disassembly on page 15).

SpeakerA single speaker is located on the left side of the computer behind the front bezel, inside the chassis. It is secured by a white peg that you

Hard driveFor a list of available hard drives, see Computer major components on page 3.NOTE: Before you remove the old hard drive, be sure to back up

Hard drive connectorThe hard drive connector is installed in the hard drive cage and connects to the system board.1. Prepare the computer for disassem

Safety warning noticeWARNING! To reduce the possibility of heat-related injuries or of overheating the device, do not place the device directly on you

Drive cage1. Prepare the computer for disassembly (Preparation for disassembly on page 15).2. Remove the access panel (Access panel on page 16).3. Rem

M.2 PCIe solid state drive (SSD)For a list of available solid-state drives, see Computer major components on page 3.1. Prepare the computer for disass

WLAN moduleFor a list of available WLAN modules, see Computer major components on page 3.1. Prepare the computer for disassembly (Preparation for disa

BatteryThe battery that comes with the computer provides power to the real-time clock. When replacing the battery, use a battery equivalent to the bat

5. Lift the battery out of the holder.6. Slide the replacement battery into position, positive side up. The battery holder automatically secures the b

Expansion connector boardFor a list of available expansion connector boards, see Computer major components on page 3.An expansion board can be install

Memory modulesThe computer comes with at least one small outline, dual in-line memory module (SODIMM). To achieve maximum memory support, you can popu

Item Description System Board Label Slot Color1 Memory module slot, Channel B DIMM1 Black2 Memory module slot, Channel A DIMM3 BlackThe system will au

3. Tilt the fan up using the front tab and leave it in the up position.NOTE: It is not necessary to fully remove the fan to remove or install a memory

Fan1. Prepare the computer for disassembly (Preparation for disassembly on page 15).2. Remove the access panel (Access panel on page 16).3. Disconnect

iv Safety warning notice

Heat sinkCAUTION: The bond between the heat sink and the processor may be very tight. If the computer will power on, before removing the heat sink, tu

Heat sink 33

ProcessorFor a list of available processors, see Computer major components on page 3.1. Prepare the computer for disassembly (Preparation for disassem

System boardNOTE: All system board spare part kits include replacement thermal material.NOTE: System board appearance may vary.1. Prepare the computer

b. On models without a hard drive, disconnect the speaker cable from the system board (1), and then remove the ve Torx T15 screws (2) that secure the

Updating SMBIOS InformationWhen replacing the system board, you must reprogram the SMBIOS information on the aected computer. Failure to reprogram th

System board componentsSys Bd Label Color Component Sys Bd Label Color ComponentCPUFAN White Processor fan SPKR White SpeakerCPU Black Processor

Internal WLAN antenna cablesThe antennas route from the WLAN module to the cable connectors on the front and the rear of the computer.To install the a

15. Rotate and remove the antenna (3), and then pull the cable out of the front of the chassis (4).Reverse the removal procedure to install the WLAN a

Changing from desktop to tower congurationThe computer can be used in a tower orientation with an optional tower stand that can be purchased from HP.

Table of contents1 Product features ...

5 Computer Setup (F10) UtilityComputer Setup (F10) UtilitiesUse Computer Setup (F10) Utility to do the following:●Change settings from the defaults or

4. Use the arrow (left and right) keys to select the appropriate heading. Use the arrow (up and down) keys to select the option you want, then press E

Computer Setup–MainNOTE: Support for specic Computer Setup options may vary depending on the hardware conguration.Table 5-1 Computer Setup—MainOpti

Table 5-1 Computer Setup—Main (continued)Option Description●Hardware subsystem tests●Component tests●Show test logs●Language selectionUpdate System B

Table 5-1 Computer Setup—Main (continued)Option DescriptionApply Factory Defaults and ExitRestores the factory system conguration settings to the co

Table 5-2 Computer Setup—Security (continued)Option Description●Requires at least one lower case character●Allow spacesClear Password JumperSelect ‘H

Table 5-2 Computer Setup—Security (continued)Option Description●Unprovision SPMPhysical Presence Interface. Noties the user upon system power up whe

Table 5-2 Computer Setup—Security (continued)Option DescriptionRecover in the event of corruption - automatically recover with no prompting.System Ma

Table 5-3 Computer Setup—Advanced (for advanced users) (continued)Option HeadingRecovery from Network Allows network recovery as the primary source.R

Table 5-3 Computer Setup—Advanced (for advanced users) (continued)Option HeadingPCI Express Slot x (enable/disable)Lets you disable individual expans

Front bezel ...

Table 5-3 Computer Setup—Advanced (for advanced users) (continued)Option HeadingPort Options Lets you disable the following ports (default is enabled

Table 5-3 Computer Setup—Advanced (for advanced users) (continued)Option HeadingS5 (Soft O) = LED is o.Power On from Keyboard Ports (enable/disable

6 Troubleshooting without diagnosticsThis chapter provides information on how to identify and correct minor problems, such as USB devices, hard drive,

If it becomes necessary to call for technical assistance, be prepared to do the following to ensure that your service call is handled properly:●Be in

●If you have installed an operating system other than the factory-installed operating system, check to be sure that it is supported on the system.●If

Computer date and time display is incorrect.Cause SolutionRTC (real-time clock) battery may need to be replaced.NOTE: Connecting the computer to a liv

Poor performance.Cause SolutionHard drive fragmented. Defragment hard drive.Program previously accessed did not release reserved memory back to the sy

System does not power on and the LEDs on the front of the computer are not ashing.Cause Solution1. If equipped with a voltage selector, check that th

Computer powered o automatically and the Power LED ashes Red two times, once every second, followed by a two second pause, and the computer beeps tw

Nonsystem disk/NTLDR missing message.Cause SolutionThe system is trying to start from the hard drive but the hard drive may have been damaged.▲ Perfor

Solving keyboard and mouse problems ... 69S

Solving media card reader problemsMedia card will not work in a digital camera after formatting it in Windows.Cause SolutionBy default, Windows will f

After installing the media card reader and booting to Windows, the reader and the inserted cards are not recognized by the computer.Cause SolutionThe

Blank screen (no video).Cause Solution2. Expand the Resolution box, and then use the sliding control to reset the resolution.Monitor is congured to u

Dim characters.Cause SolutionThe brightness and contrast controls are not set properly. Adjust the monitor brightness and contrast controls.Cables are

“Out of Range” displays on screen.Cause SolutionVideo resolution and refresh rate are set higher than what the monitor supports.Restart the computer a

Solving audio problemsIf the computer has audio features and you encounter audio problems, see the common causes and solutions listed in the following

Sound from headphones is not clear or mued.Cause SolutionHeadphones are plugged into the rear audio output connector. The rear audio output connector

Printer will not print.Cause Solutionwhere [printer port] is the address of the printer being used. If the printer works, reload the printer driver.To

Keyboard commands and typing are not recognized by the computer.Cause SolutionKeyboard connector is not properly connected. Shut down the computer, re

Solving hardware installation problemsYou may need to recongure the computer when you add or remove hardware, such as an additional drive or expansio

Appendix B Statement of memory volatility ... 96Non

Power LED ashes Red three times and then white two times.Cause SolutionMemory is installed incorrectly or is bad. CAUTION: To avoid damage to the DIM

Network status link light never ashes.NOTE: The network status light is supposed to ash when there is network activity.Cause SolutionTo access Devic

Network controller stops working without apparent cause.Cause SolutionThe cable is not securely connected. Ensure that the cable is securely attached

System will not boot or does not function properly after installing additional memory modules.Cause SolutionA memory module is not installed in the DI

Solving USB ash drive problemsIf you encounter USB ash drive problems, common causes and solutions are listed in the following table.USB ash drive

Unable to connect to the Internet.Cause SolutionCable/DSL service is not available or has been interrupted due to bad weather.Try connecting to the In

“Illegal Operation has Occurred” error message is displayed.Cause SolutionSoftware being used is not Microsoft-certied for your version of Windows.Ve

7 POST error messages and diagnostic front panel LEDs and audible codesThis appendix lists the error codes, error messages, and the various indicator

Control panel message Description Recommended actionRTC (real-time clock) battery may need to be replaced.problem persists, replace the RTC battery. S

Control panel message Description Recommended action00E-Inventory Error during MEBx Execution BIOS information passed to the MEBx resulted in a failur

1 Product featuresStandard conguration featuresFeatures may vary depending on the model. For a complete listing of the hardware and software installe

Control panel message Description Recommended action3. Back up contents and replace hard drive.302-Hard Disk 2: SMART Hard Drive Detects Imminent Fail

Control panel message Description Recommended action3. Recongure card resources and/or run Computer Setup or Windows utilities.419-Out of Memory Spac

Control panel message Description Recommended action90B-Fan Failure The system has detected that a cooling fan is not operating correctly.1. Reseat fa

Number of long beeps/blinks Error category4 Thermal5 System boardPatterns of blink/beep codes are determined by using the following parameters:●1 seco

8 Password security and resetting CMOSThis computer supports security password features, which can be established through the Computer Setup Utilities

1. Shut down the operating system properly, then turn o the computer and any external devices, and disconnect the power cord from the power outlet.2.

Clearing and resetting the BIOSThe CMOS button resets BIOS settings to default, but does not clear the passwords or aect any of the other Security se

9 Using HP PC Hardware DiagnosticsUsing HP PC Hardware Diagnostics WindowsHP PC Hardware Diagnostics Windows is a Windows-based utility that allows yo

Downloading the latest HP PC Hardware Diagnostics Windows versionTo download HP PC Hardware Diagnostics Windows, follow these steps:1. Go to http://ww

NOTE: If you need to stop a diagnostic test, press esc.Starting HP PC Hardware Diagnostics UEFITo start HP PC Hardware Diagnostics UEFI, follow these