Hi,
When you say you wiped the DMS clean - what did you actually do? Did you just delete files using the Phatnoise software, or did you reformat either or both of the PHTSYS and PHTDTA partitions, or did you go further and delete the partitions themselves? You say that you renamed the second drive - how and to what? My guess is that this is your problem. The two names must be PHTSYS and PHTDTA. Also, it may help if you can tell us whether your Phatbox has been patched / hacked to accept non-original DMS drives.
Sorry if it's a lot of questions, but they help narrow down the possibilities of what may be wrong.
BTW - as a general rule don't ever delete the partitions on an original DMS drive - you may create problems that are much harder to solve...
Les.