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Helpful answers
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Jan 27, 2016 2:32 PM in response to mtm86by lllaass,Prohibitory symbol
When you see a circle with a slash symbol instead of the Apple logo, it means your Mac couldn't find a valid System Folder to start up from.
If you're using your Mac at a school or business, it might be trying to start from the wrong version of OS X. Contact your IT department for more help.
If this is your personal Mac, try reinstalling OS X by using OS X Recovery.
If your Mac does not have Internet Recovery then you will have to insert OSX install DVD and boot from that DVD and install OSX from DVD.
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Jan 27, 2016 4:24 PM in response to mtm86by Barry Hemphill,Take it back to whoever installed the HD and tell them to fix it.
Barry