Proxmox not rebooting properly

Hi everyone!

I’m running Proxmox on a NiPoGi AK2 Plus MiniPC (n100, 1 TB, 16GB RAM)

Everything works great for the most part – VMs are running fine, access works perfectly, and everything seems to be smooth… except for one annoying issue: whenever I reboot the machine (either through the terminal or the web interface), Proxmox won’t boot back up. Instead, the system just lands in the BIOS. It looks like the hard drive isn’t being detected anymore during reboot, as it disappears from the boot sequence altogether. But coldstart works fine without any problems.

However, if I physically disconnect the power or manually restart the PC using the button, everything works as expected again. The boot menu appears briefly, Proxmox loads up, and the system starts just fine.

I’m stumped and can’t seem to find much useful info online about this issue. I’ve already tried tweaking the power settings and going through various configurations, but no luck so far.

Does anyone have any ideas on how to fix this or what else I could try to troubleshoot the problem?

BIOS Update isn't aviable, Reset done multiple times.

Thanks in advance!

Maybe a BIOS update or a Linux kernel update (as this is not specific to Proxmox) will fix it in the future. If you want a work-around then search for the kernel parameter reboot= in the Linux documentation: https://www.kernel.org/doc/html/v6.8/admin-guide/kernel-parameters.html . Try the various options and see what works for your specific motherboard.

EDIT: This worked for me some years ago until a BIOS update and/or a kernel update fixed it.

Last edited: May 28, 2026

Maybe a BIOS update or a Linux kernel update (as this is not specific to Proxmox) will fix it in the future. If you want a work-around then search for the kernel parameter reboot= in the Linux documentation: https://www.kernel.org/doc/html/v6.8/admin-guide/kernel-parameters.html . Try the various options and see what works for your specific motherboard.

I reinstalled VE 8.4 and this is running out of the box, with the same BIOS Settings.
I also tired install Debian Tixie, works out of the Box.
Strange that only by request a reboot the system stuck. If i poweroff and power on again, it's working fine.
However
VE 9 is also running on by Backup PM VE, i updated them to VE9 without problems.
So i would not play around with Kernel parameters. I stay on 8.4 until the Problem is solved by Linux Kernel Update.
Perhaps a BIOS Update is available, i will try out.

Last edited: May 28, 2026

Very annoying if a cold start works but a reboot doesn't!
It seems that BIOS somehow doesn't find the harddisk or EFI partition after a reboot.
To confirm; by going into the BIOS after a reboot you don't see the disk and the boot option there?

I assume you experience this with the latest PVE 9.2.x with Linux kernel 7.0.x and UEFI boot?
Trixie and PVE 8 are still on Linux 6.x. You could try to install Linux 6.x on Proxmox 9 and see if that works:
apt install proxmox-kernel-6.17 or even apt install proxmox-kernel-6.14.

Last edited: May 28, 2026

Bios Update did the trick.
There was one newer version available. After Update the Bios, everything is working, incl. Secure Boot.
Thanks.

Hi,

This sounds more like a hardware/BIOS issue than a Proxmox issue, since the system works fine after a full power off and only has trouble on reboot.

You may want to check the BIOS boot settings again (especially Fast Boot / boot mode), and also confirm whether the SSD is being detected properly after a reboot.

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