Hmmm I would think the issue is with the ide drive. I purposely purchased a SATA DVD drive for this build. At $20 it was cheap enough. I have 3 drives in my system; 1 for OSX, 1 for Win 7, and 1 to image the OSX drive so I can make changes without always having to start from scratch.

I think the issue with the drives is that the bios searches for the SATA and IDE drives on the same channel (at least that my take from reading the POST message) and perhaps there are IRQ issues with this in OSX.

Drive config:
SATA 0 - OSX
SATA 1 - Win7
SATA 2 - OSX image backup
SATA 3 - DVD drive