frozen MacPro startup

While working online screen of my MacBook Pro suddenly went grey. I turned off by holding the power button, and then he started upward. He would charge the Apple starts the bar and after it went down to about 1/3 of the way suddenly turned. I tried a few times and then opened it in safe mode. Ran repair disk and after having received the message in green "everything seems to" correct the screen froze. He said there were five minutes to go and I waited at least 20 minutes. I then typed my mouse and the Rainbow ball began the round and I've waited longer until I turned it off again. I tried to go back to the top and got a flashing question mark inside a folder. It off and starts in safe mode this time the Bar starts but remains stuck at halfway through and will not move. Any suggestions what I can do? Thanks for your time!

-Try to reset memory NVRAM/PRAM and SMC

MacIntel: Reset of the controller (SMC) system management

https://support.Apple.com/en-us/HT201295

Subject of memory NVRAM and PRAM

https://support.Apple.com/en-us/HT204063

-Try to start safe mode

OS x: what is Safe Boot, Safe Mode?

https://support.Apple.com/en-us/HT201262

-Start to recovery and repair the startup disk

OS X: on 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 using disk utility to restore the internal drive to an external drive, so that you can try to recover the data.

Format the boot disk and then do a fresh install of Mac OS x

This is the Office Mac Pro forum. I asked that your post moved to the forum of laptop MacBook Pro or another appropriate forum.

Tags: Notebooks

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