I just got my hot hands on a retail Leopard install DVD(it came with an MDD that I bought from a forum member here) and was anxious to do a fresh Leopard install on my TiBook. Mine is the last generation model, and can officially support Leopard without using any work-arounds. It has an 867mhz processor, and I just upgraded it to 1gb ram(I think the max). The issue I'm having is that it spits the Leopard DVD back out as soon as I put it in the drive. As I said, this is a real, genuine Apple retail install DVD. I know that the optical drive can read DVDs, as I installed Tiger from a DVD. Is the issue with it being a double layer disk? If so, I guess that "option B" is to boot the TiBook in target disk mode and run the Leopard installer from my G5. I'd rather just install it natively, though. Any thoughts on what could be going on?