I just found out after a long night and a phonecall to AppleCare that the 10.4.9 install discs that came with my MBP are corrupt, but somehow pass the verification. Long story short new discs are coming my way but will take a whole 7 to 10 days to get here. Of course, I am leaving town on Monday for two weeks and was planning on taking the nearly brand new MBP with me. Now my best option is to head to the Apple Store (not hugely convenient where I'm at) and have them "verify the problem is with the discs" by running the installer. The good news, I leave with a copy of 10.4.9 running successfully on my computer. The bad news, I probably can't get out there in time to do it. I do, however, have a friend with a 17 inch MBP pre-Santa Rosa. Anyone have any insight into whether this will work on my Santa Rosa 17in? Thanks for any insights into the mysteries of the Mac OS Installers! Oh...and I just noticed the Subject. Should've been DVD, not CD.