HP ProDesk 400 G3 Repair
If your HP ProDesk 400 G3 will not start, shows no picture, runs hot or has become slow, we can diagnose and repair it at our Bermondsey workshop. It is a desktop PC from 2016. Parts are matched to the exact chassis, so the model number matters when we quote.
- Model number
- 400 G3
- Released
- 2016
- Type
- Desktop PC
- Storage
- SATA bays and M.2, by configuration
- Memory
- DIMM slots
What we repair on the HP ProDesk 400 G3
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 G3 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 G3 uses standard desktop memory. We check the board's limits and fit matched modules.
Windows repair and reinstall
This model does not meet Microsoft's Windows 11 requirements, and Windows 10 reached end of support in October 2025. We can advise on the realistic options, including a lightweight Linux or ChromeOS Flex installation.
We also carry out motherboard repair, overheating and fan repair, virus removal on the HP ProDesk 400 G3, 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 G3
Desktop drives are removed and imaged on our own equipment. If the HP ProDesk 400 G3 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 G3 sits in the range
Its nearest relatives in the HP EliteDesk and ProDesk range are the older HP EliteDesk 800 G2 (2015) and the newer HP EliteDesk 800 G3 (2017).
Questions
Can the SSD or memory in the HP ProDesk 400 G3 be upgraded?
Drives can be added or replaced. Memory uses standard slots and can be increased.
My HP ProDesk 400 G3 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.
Is a 2016 HP ProDesk 400 G3 still worth repairing?
It depends on the fault. A battery, SSD or charging socket is usually worth doing. A major board repair on an older machine may cost more than the machine is worth, and if that is the case we will say so.
Where do I find the model number on my desktop PC?
The model is on a label on the back, side or underside of the machine. For this model, look for 400 G3.