Le 29/04/2019 à 07:41, Michael Strack a écrit :

1\. Get GRUB shell by booting Super GRUB2 Rescue Disk on DVD (i386-pc
version)

2\. Run ls with no USB storage attached; detects internal HDD (and
partitions) and CD/DVD-ROM drives as expected

3\. Reboot after plugging in USB storage and run ls; hangs with
increasing fan spin

Sounds like a firmware bug.

\- Made bootable USB media under Windows using Rufus (for legacy
BIOS/MBR target) and confirmed working

What bootable media ? Using what image and/or bootloader ?
What do you mean by "confirmed working" ?
Did you try to run ls after booting GRUB from USB ?

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