The reason Safe Mode often works to correct instances where startup indefinitely stalls is that in addition to disabling non-essential extensions (its main function), booting in Safe Mode performs a startup disk directory check, clears certain caches and performs other routines that can eliminate problems in time for the next restart. ![]() In many cases, simply booting in Safe Mode once, then restarting normally can resolve seemingly serious issues occurring at startup. One of the most underrated features in Mac OS X is its use of maintenance routines that are inconspicuosly built into easily accessed procedures. Caches and hardware drivers are also key leads in isolating a cause. ![]() If you experience startup problems after installing an incremental Mac OS X update, it's logically important to check items that load at startup for conflict with updated components in the new release.
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