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Mac OS X Fails to Start After System or Security Update

A Mac OS X computer system might behave abruptly after you install any major Mac OS X update. In severe situations, the computer might fail to boot. To solve these problems, you might need to reinstall the operating system which deletes and causes data inaccessibility. If a valid data backup is not available in such situations, you will need to use a Data Recovery Mac software.

For instance, suppose you use a Mac OS X based computer system. You install a Mac OS X 10.4.5 or a security update. After this, when you try to boot the computer, you observe a blank grey or blue screen with no access to stored data. Alternatively, you might experience that the system pauses indefinitely at the Apple logo.

Solution

You should try solving system startup issues post installing Mac OS X updates by these methods:

Boot errors can occur due to corruption of cache and .plist files. Try deleting the files by starting the computer in Safe mode by holding ‘Shift’ key while startup

If the login or startup items are faulty, this might create issues while boot. You should boot the computer in safe mode, go to System Preferences through Accounts page and remove all the login items. You also need to check /System/Library/StartupItems  and /Library/StartupItems folders to remove third-party items.