Last weekend I posted about issues with performing an Upgrade installation of Leopard on one of my MacBook Pros. That machine is happily running Leopard now with all my data fully intact. But I learned something in the process.
I made a backup of my Tiger installation just prior to performing the upgrade and was able to boot to the backup without difficulty. I also used Disk Utility (the Mac’s onboard disk integrity check and repair tool) to check both of the partitions on the computer’s hard drive. Everything checked out, so I went ahead with the upgrade.
As detailed earlier, I ran into the hanging blue screen after installation on the first restart that many other Leopard upgraders experienced. Many people had reported that the problem cleared up for them when they followed one of two methods for removing a Mac OS X customization utility by Unsanity called Application Performance Enhancement (APE). I didn’t have APE installed on my system, but it had been there and uninstalled with leave-behinds. I used Target disk mode to access the hard drive and remove the offending files. That didn’t solve my problem, so I decided to resort to my backup. So I removed the same offending files there just to be safe, wiped my boot volume, and copied my backup to the boot volume. During the copy process I got the error message that I didn’t have rights to copy three or four unnamed files — a message that made no real sense. And it was at that point that I knew I was in for it.