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That being said, don’t forget Murphy’s law — eventually something will go wrong. When it does, you may as well be prepared, so it’s a good idea to have the right tools handy and to polish up on your troubleshooting skills. You can kill a number of these birds with a single stone using the handy utility AppleJack.

AppleJack is a user friendly troubleshooting assistant for Mac OS X. With AppleJack you can troubleshoot a computer even if you can’t load the GUI, or don’t have a startup CD handy. AppleJack runs in Single User Mode and is menu-based for ease of use.

Using AppleJack, you can repair your disk, repair permissions, validate the system’s preference files, and get rid of possibly corrupted cache files. In most cases, these operations can help get your machine back on track. The important thing is that you don’t need another startup disk with you. All you need to do is restart in Single User Mode (SUM), by holding down the command and s keys at startup, and then typing applejack, or applejack auto (which will run through all the tasks automatically), or applejack auto restart (which will also restart the computer automatically at the end of the process).


Please read Dan Frakes’s article about AppleJack before use this great software.

Release Name
5 MB

GD Star Rating
GD Star Rating
AppleJack, 9.0 out of 10 based on 1 rating
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