I have experience with pre-owned FAS2XXs. Did this one come from the NetApp bone yard or from Ebay ?
The Data ONTAP version you're seeing is from the current kernel loaded in flash.
It's probable that the disks installed are not from a running install.
You can press 'Ctrl-C' while the kernel is booting to access the boot menu.
Then try option 4a on the menu to attempt to zero out the disk drives and install a new flexible root volume.
This process may fail if the disks had previous software ownership assigned.
If so, you can re-boot and access the boot menu again.
This time enter '22/7' at the boot menu prompt to access the maintenance mode boot menu.
There are options to unassign/reassign the disk drives available.
You'll need access to the NOW.NetApp.com site to download a new copy of Data ONTAP to install on this box.
I hope this response has been helpful to you.
At your service,
Eugene E. Kashpureff
ekashp@kashpureff.org
NetApp Instructor and Independent Consultant
http://www.linkedin.com/in/eugenekashpureff
(P.S. I appreciate points for helpful or correct answers.)