Hello,
You are correct,
DBAN does not break down RAID arrays so the first thing is to create a RAID 0 array for each drive in the system.
On power-up wait for RAID array, prompt and press F8 enter the RAID setup. Delete any RAID arrays currently on the system. Press "Create RAID". Deselect all drives except for one and press Enter, then F8.
Repeat the process for each of the remaining drives.
If it doesn't work, you have to replace the system board.
If you feel this was helpful please click the KUDOS! thumb below!
Regards,