Proc.new

I ran into the Leopard upgrade problem that others have been reporting. The problem happens after you do a successful upgrade and the system reboots. It then hangs at the blue screen prior to login. Other people have wiped the disk and proceeded with a fresh install. While I could have done that, I didn’t want to take the time to rebuild my machine totally from scratch. After doing a Google search for “leopard upgrade problems” I came across this comment on digg:

by indiekiduk 10 hours ago
This problem appears to be an unfortunate incompatibility with ShapeShifter software you might have installed.

Do this and it fixes it (worked for me)

1. Reboot into single-user mode (hold Cmd-S while booting machine)
2. Follow the directions OSX gives you when you get to the prompt (I think these were them - just type the two commands it tells you to):
fsck -fy /
/sbin/mount -uw /
3. Remove the following files:
rm -rf /Library/Preference Panes/Application Enhancer.prefpane
rm -rf /Library/Frameworks/Application Enhancer.framework
rm -rf /System/Library/SystemConfiguration/Application Enhancer.bundle
rm -f /Library/Preferences/com.unsanity.ape.plist
4. Exit, to continue booting normally
exit

I checked the locations first, and sure enough, those files existed on my system as well. After deleting them I booted into Leopard just fine. There are a few typos in the paths above, but I decided to copy the post from Digg verbatim. The original link is here. Hopefully this blog post will help prevent a few people from needlessly nuking their hard drive.