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Helpful answers
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Feb 24, 2016 2:20 PM in response to robertfromjunctionby 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.
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Feb 24, 2016 2:41 PM in response to lllaassby robertfromjunction,I cannot get to any screen except the install screen that freezes and goes to the circle with line through. Dont know how to boot to OS recovery screen
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Feb 24, 2016 2:54 PM in response to robertfromjunctionby lllaass,- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
- Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
- Boot to Recovery and repair the startup disk
OS X: About OS X Recovery - Apple Support
- If it is repairable reinstall the OSX
How to reinstall OS X on your Mac - Apple Support
- If you do not have a backup use disk utility to restore the internal disk to an external disk so you can try to recover data.
Then format the startup disk and do a fresh install of OSX
If a flashing question mark appears when you start your Mac
What model MacBook Pro?