Apple macbook air 13 inch User Manual

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Chapter 3   
Problem, Meet Solution
Repairing, Restoring, or Reinstalling Mac OS X Software
If you have a problem with your Mac software or hardware, Mac OS X provides repair
and restore utilities that may eliminate problems and can even restore your software
to its original factory settings. You can access these utilities from the Mac OS X Utilities
application, even if your computer isn’t starting up correctly.
Use the Mac OS X Utilities application to:
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Repair your computer’s disk using Disk Utility.
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Restore your software and data from a Time Machine backup.