updated 01:15 pm EDT, Mon October 29, 2007
Leopard install freezes
UPDATE: Apple has now acknowledged issues with Leopard installation that can result in an everlasting blue screen after the install has taken place. Blaming the problem on "third-party 'enhancement' software," namely Unsanity's APE (Application Enhancer) and its included haxies, Apple says the problem can be resolved by either reinstalling Leopard (recommended), or using the Terminal to uninstall APE and its haxies. The first fix requires performing an Archive and Install installation of Leopard. Archive and Install moves your existing Mac OS X system files to a folder named "Previous System," and then installs a new copy of Mac OS X on the selected volume. Apple says "After installation, verify each third-party software product is compatible with Leopard before reinstalling it, especially any application 'enhancement' software."
The second fix requires starting up in single-user mode by holding Command-S after restarting the computer, then executing a series of commands that will remove the offending software. However, according to Apple. if the problem still exists after uninstalling APE, you may need to resort to the first, recommended fix: performing an Archive and Install.
A number of users who have bought Mac OS X Leopard have been experiencing stalled upgrade installations, Apple's forums reveal. Upon nominally completing the installation process, some Macs have rebooted only to become stuck at a blue screen, requiring users to manually shut them down. Apple is said to already be aware of the issue, but the exact causes are at present unknown; some have suggested problems with attached peripherals, DivX Application Support or Tiger's RAID technology, but these factors are not constant.
A recurring suggestion is the presence of Unsanity's Application Enhancer program, though this too has not been reported on all frozen Macs. MacFixit has posted a guide for removing Application Enhancer, as well as handling other potential fixes. The site ultimately recommends though that if installations continue to freeze, users should attempt to boot from the Leopard DVD by holding down "C" at start-up, and picking either "Archive and Install" or "Erase and Install" instead of the Upgrade option.
Apple on Saturday released a patch for less severe issues, fixing Wi-Fi connections, logins for users upgrading from Mac OS X 10.1, and password changes for FileVault-protected accounts.