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Helpful answers
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Jan 1, 2016 3:06 PM in response to Taylorlemansby MattFarrell123,I'm f you're using Mac OS X 10.2 or later, you can start up your computer in Safe Mode, which includes an automatic disk check and repair. Hold down the shift key on start up. If this works follow these procedures:
http://support.apple.com/kb/TS1417
Hope this helps
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Jan 1, 2016 3:07 PM in response to Taylorlemansby 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.