Unfortunately that quick fix didn't work for me 🙁. I think I'm going to bite the bullet and pick up a new 2.8 8-core refurb Mac Pro. I don't expect new chips to be released by Intel for Apple until at least mid/end Q1 2009, so I think it's safe to pick up the current model. $2499 refurb when it's posted on the Apple site... not bad, still a kick in the pants though. Thanks to everyone for their troubleshooting tips and input!