HT203421: Troubleshooting the Mac App Store
Learn about Troubleshooting the Mac App Store
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Helpful answers
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Feb 15, 2014 11:38 PM in response to svassalloby mende1,Welcome to Apple Support Communities
OS X Mavericks is damaged in your MacBook. Hold Command and R keys while your Mac is starting up to start up into OS X Recovery, and reinstall Mavericks.
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