PBS does only boot with USB Stick

Hi,

I'm using PVE since a few months, and to complete my setup I made an old PC to a PBS. The installation worked well and very fast. Also the first steps and backups were really easy.

But now I found a weird issue. The system does only start if the Install-Stick is plugged in. Without the stick the boot process stops with the message:
With the stick everything works well.

The installation partition is my ssd. The iso image is a fresh download in...

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