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Helpful answers
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Mar 1, 2016 2:24 AM in response to Vega28by 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.
In the USA you have 90 days of free telephone support so you can call Apple if you want.
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Mar 1, 2016 3:41 AM in response to KimUserNameby lllaass,The information/image in my previous reply was from that link.
KimUserName wrote:
See the following technote About the screens you see when your Mac starts up - Apple Support
Kim