[David M. belko]

Try this. reset SMU https://docs.info.apple.com/article.html?artnum=304123 Also zap the PRAM. I had the same problem on a system of G-Raids that worked fine on a Powerbook but not on the Mac Pro. Re-cabling, DiskWarrior, Permissions, nothing fixed the problem until I reset the SMU.

David
Edit One, Inc.