* display the QR login,
* complete account login,
* load my library.
The UI then freezes (sometimes the Steam logo freezes) and the system reboots. This repeats indefinitely.
I also verified the boot config and changed the image state from reboot (self) to boot-ok, didn’t work.
Brand-new Steam Machine (512 GB).
Immediately out of the box it entered an endless reboot loop.
I used the official SteamOS recovery image to perform a full re-image.
NVMe SMART passes with no media or integrity errors.
SteamOS installs successfully and boots far enough to: