i removed the dom since i want it to always boot from usb - but as soon as i chuck in any harddisk it fails to boot. tried to disable SATA like the wiki suggests, but then all SATA harddisks are gone and cannot be used :(
only option so far seems to fix the reset button on the back and never...
edit: OH MY GOD while typing this thing up i found a simple solution:
Bootet manually into unraid
gdisk /dev/sdX -> found out the disks still had an MBR, created a blank GPT, w for writing it
dd if=/dev/zero of=/dev/sdX bs=512 count=1 to remove the MBR
unplugged the dom
reboot -> boots from...