Question HP EliteDesk 800 G4 Mini: Random Hard Resets. How to fix?

[QuestionAsker]

Got a HP EliteDesk 800 G4 Mini as my first homelab, running Proxmox VE, with one VM to run my services.

However I’m getting random hard resets every 1-2 days, causing my services to go offline, and having to manually restart the VM.

No kernel panic, OOM, or I/O errors. Just showing “crash” when I run last reboot .

Specs:

1. HP EliteDesk 800 G4 Mini
2. i7-8700T
3. 64GB RAM (2x32GB Samsung DDR4 2666 SODIMM, non-ECC)
4. NVMe 1: SK Hynix PC611 256GB (OS)
5. NVMe 2: Samsung 990 PRO 1TB (firmware 5B2QJXD7)
6. ZFS on root
7. 90W OEM HP power brick

Running:

1. Proxmox VE (Debian trixie base)
2. Debian VM running:
   • WireGuard
   • Gitea (Docker + Postgres)
   • Joplin Server
3. Light homelab services, nothing crazy load-wise

So far, have confirmed:

• No OOM events
• No kernel panic logs
• No MCE / hardware error logs
• NVMe SMART clean (0 media errors, no critical warnings)
• Temps normal
• ZFS ARC tiny (~250MB)
• unsafe_shutdowns incrementing on NVMe (suggesting abrupt power loss(?))

It looks like a hard power-level reset (Logs just stop)

Power brick is 90W OEM HP (19.5V 4.62A).

---

I’m about to run memtest overnight to rule out RAM.

Has anyone run 64GB in this model long-term and seen similar instability?
Is 90W borderline once you’re running 64GB + 2x NVMe + ZFS + VMs?

Anything else I should be checking before I replace the power adapter?

Wondering if anyone else has issues running these Minis as hypervisors.

 

[JackMDS]

I have the same type of Mini computer and had similar problems.

Upgrading the PSU from 90W to 130w solved my problem


😎

 

[mikeymikec]

I had a customer's AIO HP PC in recently because the laptop-charger-type PSU blew. It came with a 120W charger. I got a genuine HP replacement for it (120W again), and during stress-testing the peak usage I saw was over 100W. I've warned the customer that if it blows again, we should definitely think about getting a more capable PSU.