HP ProDesk 400 G4 Maintenance And Service Manual

To enter the Computer Setup (F10) Utilities menu, turn on or restart the computer and repeatedly press F10 when the monitor light turns green. Alternatively, you can press Esc to access a menu with different startup options, including the Computer Setup utility. For more information, see page 52 of the manual.

Was this helpful? Why is my HP ProDesk 400 G4 not turning on?

Power connection: Check that the unit is plugged into a working AC outlet. Ensure the power button cable is properly connected to the system board, and check that the power supply cables are properly connected.
Voltage selector: If equipped, check that the voltage selector is set to the appropriate voltage for your region.
System board issues: If the 5V_aux light on the system board is on but the computer doesn't turn on, replace the power button assembly. If the 5V_aux light is off, replace the power supply or the system board.
Power button: Press and hold the power button for less than 4 seconds. If the hard drive LED turns white, but the system doesn't power on, try removing expansion cards one at a time or replacing the system board.

Was this helpful? How to perform a factory reset on the HP ProDesk 400 G4?

Type "recovery" in the taskbar search box and select HP Recovery Manager. HP Recovery Manager allows you to recover the computer to its original factory state using HP Recovery media or the HP Recovery partition.
Select the Factory Reset option, which restores the computer to its original factory state by deleting all information from the hard drive, re-creating partitions, and reinstalling the original operating system and software.

To use the Computer Setup (F10) Utility:

Access the Computer Setup (F10) Utility. (See "How to enter BIOS on HP ProDesk 400 G4?")
To restore settings from the Advanced and Main menus to original values, select Apply Factory Defaults and Exit.

Was this helpful? Can I install an SSD in my HP ProDesk 400 G4?

Yes, the HP ProDesk 400 G4 supports the installation of solid-state drives (SSDs). Compatible types listed include SATA-3 solid-state drives and 2280 M.2 NVMe solid-state drives. For more information, see page 14 of the manual.

Was this helpful? Why is my HP ProDesk 400 G4 beeping and not turning on?

Processor thermal protection activated: The computer may power off automatically and beep two times. Ensure that the computer air vents are not blocked and the processor cooling fan is running. If the fan does not spin, ensure the fan cable is plugged onto the system board header, and if it's still not spinning, replace it.
Memory issues: If the Power LED flashes red five times and the computer beeps five times, it may indicate memory is installed incorrectly or is bad. In this case, reseat the DIMMs or replace faulty modules. If the Power LED flashes red three times and then white two times, it also points to memory installed incorrectly or is bad. Reseat DIMMs or replace faulty modules.
System board failure: If the Power LED flashes red seven times and the computer beeps seven times, it may indicate a system board failure. In this case, replace the system board.

Consult the POST error messages and diagnostic front panel LEDs and audible codes section for specific error interpretations and recommended actions.

For more information, see pages 70, 75, 76, 85, 94 and 99 of the manual.

Was this helpful? How to boot from a USB drive on the HP ProDesk 400 G4?

Temporarily Override Boot Order: Restart the computer, and when the monitor light turns green, press Esc to access the Startup menu, then press F9 (Boot Menu). A list of bootable devices will be displayed, from which you can select your USB drive.
Change Boot Order in Computer Setup: Access the Computer Setup (F10) Utility and modify the boot order of bootable devices to prioritize USB flash media devices.

Was this helpful? Why is my HP ProDesk 400 G4 beeping?

If the computer powers off automatically and beeps two times, it may indicate processor thermal protection activated.
If the computer powers off automatically and beeps five times, it may indicate memory installed incorrectly or is bad.

You can refer to POST error messages and diagnostic front panel LEDs and audible codes for detailed information on interpreting these error codes.

For more information, see pages 70, 75, 94 and 99 of the manual.

Was this helpful? Why is my HP ProDesk 400 G4 not connecting to Wi-Fi?

No active network detected: Check cabling and network equipment for proper connection.
Network controller not set up properly or disabled: Check the device status within Windows (e.g., Device Manager) for driver load and link status. You may need to run Computer Setup and enable the network controller, then enable it in the operating system using Device Manager.
Incorrect network driver: Check the network controller documentation for the correct driver or obtain the latest driver from the manufacturer's website.
Network driver not properly loaded: Reinstall network drivers.
System cannot autosense the network: Disable auto-sensing capabilities and force the system into the correct operating mode.

Was this helpful? What processors are compatible with the HP ProDesk 400 G4 motherboard?

Intel Core i7: 7700 (3.60-GHz), 6700 (3.40-GHz)
Intel Core i5: 7600 (3.50-GHz), 7500 (3.40-GHz), 6500 (3.20-GHz)
Intel Core i3: 7320 (4.10-GHz), 7300 (4.00-GHz), 7100 (3.90-GHz), 6100 (3.7-GHz)
Intel Celeron: G4620 (3.70-GHz), G4600 (3.60-GHz), G4560 (3.50-GHz), G4500 (3.50-GHz), G4400 (3.30-GHz), G3950 (3.00-GHz), G3930 (2.90-GHz), G3900 (2.80-GHz)

Was this helpful? Why does my HP ProDesk 400 G4 keep freezing?

Software control of the power switch is not functional: Press and hold the power button for at least four seconds until the computer turns off. Then, disconnect the power cord from the electrical outlet.
System has locked up: Restart the computer.
Program in use has stopped responding to commands: Use the task manager to close programs that do not respond. You can also attempt the normal Windows "Shut Down" procedure; if this fails, press the power button for four or more seconds to turn off the power, then press it again to restart.
Computer is in Sleep state: Press the power button to resume from Sleep state.

Was this helpful? How to troubleshoot a 'no display' issue on the HP ProDesk 400 G4?

Ensure the monitor is turned on and its light is on. If not, try a different monitor.
Check the cable connection from the monitor to the computer and to the electrical outlet.
If the screen is blank, plug the monitor into a different video port on the computer if one is available. You can also replace the monitor with one you know is functioning properly.
If the system has multiple video sources (embedded, PCI, or PCI-Express adapters) and a single monitor, the monitor must be plugged into the monitor connector on the source selected as the primary VGA adapter. During boot, other monitor connectors are disabled.
If a screen blanking utility or energy saver features are enabled, press any key or click the mouse button and type your password (if set).
If the system ROM is corrupted and running in Boot Block Emergency Recovery Mode (indicated by eight beeps), reflash the system ROM with the latest BIOS image.
If the monitor cable is plugged into the wrong connector, try moving the monitor connection to a different connector on the back of the computer.
If the monitor settings in the computer are not compatible, adjust the screen resolution via the Control Panel.
If the monitor is configured to use an input that is not active, use the monitor's on-screen menu controls to select the input that is being driven by the system.
If the Power LED flashes Red five times and the computer beeps five times, it may indicate a Pre-video memory error. Reseat DIMMs, replace DIMMs one at a time, replace third-party memory with HP memory, or replace the system board.
If the Power LED flashes Red six times and the computer beeps six times, it may indicate a Pre-video graphics error. For systems with a graphics card, reseat the graphics card (if applicable) or replace it. For integrated graphics, replace the system board.

Was this helpful? What is the key to access the boot menu on the HP ProDesk 400 G4?

To access the boot menu on the HP ProDesk 400 G4, restart the computer and quickly press Esc. This will bring up the Startup menu, from which you can then press F9 for boot options. For more information, see pages 59 and 110 of the manual.

Was this helpful? How to find the serial number of HP ProDesk 400 G4?

The serial number and product ID number are located on the exterior of the computer. Keep these numbers available for use when contacting support for assistance. You can also find the Serial Number in the Computer Setup (F10) Utility under the System Information option. For more information, see pages 12 and 54 of the manual.

Was this helpful? How do I open the case of the HP ProDesk 400 G4 for internal access?

Prepare the computer for disassembly (refer to Preparation for disassembly on page 23).
Position the computer with the rear toward you.
Loosen the access panel locking screw (1).
Use the access panel release handle (2) to release the access panel.
Remove the access panel (3).

Was this helpful? What operating systems are compatible with the HP ProDesk 400 G4?

The HP ProDesk 400 G4 is equipped with and supports Windows 10. It also supports Windows 7 and other non-Windows operating systems.

Was this helpful? How to clear the CMOS or reset BIOS settings on the HP ProDesk 400 G4?

Shut down the operating system, turn off the computer and external devices, and disconnect the power cord.
Press the power button again to drain residual power.
Remove the access panel.
Locate the CMOS/PSWD jumper (it is blue).
Remove the jumper from pins 1 and 2.
Place the jumper on either pin 1 or 2, but not both, so it doesn't get lost.
Replace the access panel and reconnect external equipment.
Plug in the computer and turn on power. Allow the operating system to start. This clears current passwords and disables password features.
Shut down the computer, unplug the power, and disconnect external equipment. 1
Remove the access panel. 1
Place the jumper on pins 1 and 2. 1
Replace the access panel. 1
Reconnect external equipment and plug in the computer.

Using Computer Setup (F10) Utility:

To restore settings from the Advanced and Main menus to original values, select Apply Factory Defaults and Exit. This resets BIOS settings to factory defaults but does not modify settings in the Security menu.
To reset settings in the Security menu, select Restore Security Settings to Default at the bottom of the Security menu.

It is recommended to back up the computer CMOS settings before resetting them.

For more information, see pages 53, 101 and 103 of the manual.

Was this helpful? What are the physical dimensions of the HP ProDesk 400 G4 desktop?

Height: 3.7 in (95 mm)
Width: 10.6 in (270 mm)
Depth: 11.8 in (300 mm)

Was this helpful? What kind of power supply unit (PSU) does the HP ProDesk 400 G4 use?

The HP ProDesk 400 G4 uses a 180-W active PFC power supply. It operates within a voltage range of 90-264 VAC and a rated voltage range of 100-240 VAC with a rated line frequency of 50-60 Hz. This power supply is 82/85/82% efficient at 20/50/100% load (115V). For more information, see pages 13 and 124 of the manual.

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