HT1379: About NVRAM and PRAM
Learn about About NVRAM and PRAM
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Helpful answers
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Mar 24, 2014 4:23 AM in response to edulon07by Carolyn Samit,Going by your profile, your Mac has v10.9.2 installed, try a Safe Mode boot first as recommended here > OS X Mavericks: If you see a blue screen at startup
If that does not help, try using OS X Recovery to repair the startup disk if necessary, or restore OS X.
Startup your Mac while holding down the Command + R keys. From there you should be able to access the built in utilities in OS X Recovery.
OS X Recovery does require a broadband high speed internet connection.