How easy or difficult the reversion is depends heavily on whether you have a full Time Machine backup of the original system installation. The reasons for doing this will vary but the two most common are application incompatibilities and/or a dislike for the changes made to the user interface. I just installed Snow Leopard and my Mac won’t boot.One of the more interesting requests we get from OWC customers is how to revert from OS X 10.10 Yosemite to an earlier version of the system.How can I do what was previously called an Archive and Install? I know it’s fussy, but I like it.I clicked Customize in the installer-which checkboxes should I select?.How do I back up Boot Camp before upgrading, just in case something goes horribly wrong?.What are smart ways to free disk space to make more room for Snow Leopard?.How can I check if I need to run a firmware update before installing?.Under what circumstances should I partition my startup drive?.What’s Rosetta, why should I care, and what should I do about it?.What’s the deal with QuickTime and Snow Leopard?.What’s new in the Snow Leopard installer?.Is my Mac ready for a Snow Leopard installation?.Specific questions answered in this ebook include: You could run the Snow Leopard installer on your own, but you want to know the ins and outs of what’s new with the Snow Leopard installer because you are a Mac consultant, because friends and relatives rely on you for tech support, so you can wow everyone at your next MUG meeting, or simply because you like knowing exactly how things work behind the scenes.

You want to ensure a calm, successful update with no data loss or other unpleasant surprises.

You should buy this ebook if one-or both-of the following describes your situation: Want help with installing a later version of Mac OS X? Check our catalog for new editions of this ebook that will help you with later upgrades.

Solve problems that might arise after installing-such as a Mac that won’t boot.

Perform a few important post-installation tasks and tweaks.

Successfully install Snow Leopard on an Intel-based Mac.Understand just what you need to know about what the installer will do.Make a bootable duplicate in case Joe’s easy Plan A doesn’t work for you.Complete crucial pre-upgrade steps that help you avoid trouble.Evaluate if your Mac is ready to run Snow Leopard.Joe’s friendly, expert steps-developed over innumerable test installations-help you to avoid trouble, understand what’s going on when you install Snow Leopard, and easily recover from problems that might arise. Fortunately, many thousands of people have upgraded Mac OS X calmly and successfully with Joe Kissell’s previous best-selling Take Control of Upgrading… titles. Installing a major new version of Mac OS X should be exciting and fun, but without proper guidance you may find it nerve-wracking or even lose valuable files.

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