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Apr 10, 2016 2:53 AM in response to May Lamby lllaass,Folder with a question mark
If you see a folder with a question mark appear instead of the Apple logo, it means your Mac couldn't find a local or network-based startup disk. This can happen if the disk selected in the Startup Disk pane of System Preferences isn't available. Wait a few seconds to see if your Mac is able to locate the startup disk you specified.
If you still see a question mark after waiting a few moments, use Startup Manager to start up your Mac, then re-select your startup disk from System Preferences.
If a question mark appears after you install a software update, re-select your startup disk using OS X Recovery.
Last
- 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
This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.