Boot Failure in OS X After Incomplete Installation

Apple Macintosh computer uses System extensions that are small programs that can be installed on Mac OS X in order to extend system's functionality. But if the installation is incomplete, you might run into several system issues. Your Mac OS X system might become unbootable if you install a system extension, but it doesn't complete successfully. To solve such problems, you might need to perform a fresh reinstall of your system and thus, require complete data backup availability.

But if no clean backup is available, you will need to use a powerful Mac File Recovery software to restore the missing files and folders. For an instance, consider that you use a Mac OS X 10.4.7 based computer system. You might come across the below scenario with your computer:

• You configure and install Callisto Build 008 system extension on your computer
• To properly install the extension, you are prompted to restart the system
• You restart the computer, but it doesn't boot and you cannot access the stored data

Such errors might occur due to incomplete or corrupted installation of system extension. This could happen because of interrupted installation.

Try following the below steps to solve the existing boot problem:

• Boot your Mac computer using F8 and enter into Single-user and Verbose mode through -v -s boot options
• You will see a text-mode command prompt
• Next, you should check the integrity of your boot disk by running /sbin/fsck -fy command
• Mount the drive in read/write mode using /sbin/mount -uw / command
• Execute cd /System/Library/Extensions
• Delete the faulty extension by running the below commands:

rm -rf Callisto.kext and
rm -rf CallistoHAL.kext

• Exit the prompt

If you still cannot boot your computer and enter into GUI mode, perform Erase and Install of Mac OS X 10.4.7. Since the process causes files and folders to delete, use your current backup or scan the drive through an efficient Drive Recovery Mac utility.

Equipped with rich interface, advanced options and safe scanning algorithms, these Mac File Recovery products serve as suitable recovery applications in each logical data loss case.