We repair and upgrade the HP ProDesk 400 G6 at our workshop in Bermondsey, from power and start-up faults to storage upgrades and data recovery. It is a desktop PC from 2019. Parts are matched to the exact chassis, so the model number matters when we quote.
- Model number
- 400 G6
- Released
- 2019
- Type
- Desktop PC
- Storage
- SATA bays and M.2, by configuration
- Memory
- DIMM slots
What we repair on the HP ProDesk 400 G6
Power supply repair
We test and replace failed power supplies. Many branded desktops use a manufacturer-specific unit, which we match to the exact chassis.
SSD and storage upgrade
The HP ProDesk 400 G6 has room for SATA drives and, on most boards, an M.2 SSD. The usual upgrade is an SSD for Windows and programs with the old drive kept for storage.
Price confirmed before work starts
Memory upgrade
The HP ProDesk 400 G6 uses standard desktop memory. We check the board’s limits and fit matched modules.
Windows repair and reinstall
The HP ProDesk 400 G6 meets Microsoft’s Windows 11 requirements in most configurations. We upgrade from Windows 10, which reached end of support in October 2025, or reinstall Windows 11 cleanly with your files kept.
We also carry out motherboard repair, overheating and fan repair, virus removal on the HP ProDesk 400 G6, along with no-picture and no-boot diagnosis, port repair, Wi-Fi and Bluetooth card replacement and data transfer to a new PC.
Known issues with the EliteDesk and ProDesk range
- The Mini models use an external power brick and laptop-style memory; a dead Mini is often just a failed adapter.
- EliteDesk and ProDesk machines come as Tower, Small Form Factor and Mini, each with its own HP-specific power supply.
Data recovery from the HP ProDesk 400 G6
Desktop drives are removed and imaged on our own equipment. If the HP ProDesk 400 G6 has more than one drive, or a RAID array, bring the whole machine so we can see how it was set up.
Estimate the cost with our data recovery calculator, or read about recovering files after a ransomware attack.
Where the HP ProDesk 400 G6 sits in the range
Its nearest relatives in the HP EliteDesk and ProDesk range are the older HP EliteDesk 800 G4 (2018) and the newer HP EliteDesk 800 G6 (2020).
Questions
Can the SSD or memory in the HP ProDesk 400 G6 be upgraded?
Drives can be added or replaced. Memory uses standard slots and can be increased.
My HP ProDesk 400 G6 will not turn on. Is my data lost?
Usually not. The drive is separate from the fault in most cases, and we can remove it and copy your files even if the machine itself is not worth repairing.
How do I get my HP ProDesk 400 G6 to you?
Bring it to our workshop at Unit 1 The Willows, 80 Willow Walk, London SE1 5SY, or call 020 7237 6805 to ask about courier collection. We confirm the price before any work starts.
Can you upgrade the graphics card in a HP ProDesk 400 G6?
In most cases, yes. We first check the power supply, the physical space and any manufacturer-specific connectors, then fit and test the card.