Here's what I've done so far -
Removed both hard drives, reformatted - nothing
Added an additional 8TB drive with data - nothing
Added an additional 6TB new drive - nothing
None of the drives spin.
I'm starting to think it's something in the Bios. The only thing I changed there was the boot order, to boot from USB. I'll post on the TM forum also to see if they have any insight.