Shock and Awe: How Installing Apple’s Updates can Render Your Mac Unbootable and How You Can Prevent it
Please, please, folks, please go and read this article, before doing your software updates, We all know it’s a good idea to not run any other programs while Software update is running, but did you know it can make your Mac completely unbootable!?
Here’s the bottom line: Mac Software updates are important and you MUST do these as soon as possible after they are released by Apple as they contain many security fixes as well as system enhancements but remember this rule:
Every single time you install an update to Mac OS X whether it be an iTunes update, a QuickTime update, an update for daylight saving time, a security update, an Airport update, or an actual Mac OS X update, you can be hit by this bug. In order to prevent yourself from being smacked in the face by this bug, follow this simple rule: When “Optimize System Performance” appears during the update process do not touch your computer and definitely do not launch any applications. Just back away from your computer box as if it were a swarm of bees. Yes, it does mean that if you install the Mac OS X 10.4.9 update, you may get hit by the bug.