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Jul 16, 2015 2:54 AM in response to nienuby lllaass,That means a bootable drive can't be found
About the screens you see when your Mac starts up - Apple Support
For your screen that says:
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.
For more details on how to do that for Yosemite see: