HT204904: How to reinstall OS X
Learn about How to reinstall OS X
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Helpful answers
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Oct 19, 2015 4:54 PM in response to D1Guyby a brody,Use this tip to identify your Mac:
http://discussions.apple.com/docs/DOC-6413
If your data is not backed up, you should read this tip on data recovery before doing anything further: