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Jul 28, 2016 12:52 AM in response to muzikarkby lllaass,- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
https://support.apple.com/en-us/HT201295
About NVRAM and PRAM
https://support.apple.com/en-us/HT204063
- Try starting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
https://support.apple.com/en-us/HT201262
- Boot to Recovery and repair the startup disk
OS X: About OS X Recovery - Apple Support
https://support.apple.com/en-us/HT201314
- If it is repairable reinstall the OSX
How to reinstall OS X on your Mac - Apple Support
https://support.apple.com/en-us/HT204904
- 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 you do not have a backup, you may be copy files to an external disk via Recovery using Terminal
Copying Files to External Hard Drive via Terminal?
If you have another Mac there are other ways that may work to get data off the disk.
Also, you can from Recovery install OSX on an external drive and boot from that and try to get data off the disk.
If yo can get data depends upon the cause of the problem. If the disk failed then maybe a disk recovery app can get some data