Mac book pro won't go past grey start up screen

Went to turn on my Mac book pro 2011 or 2012 and it went to the grey loading screen with an apple, spinning gear and a loading bar. Once the loading bar completes my Mac book just turns off. It just keeps doing this, I tried to do a safe boot, but once it was done that it turned off and continues to do this circle of grey screen loading than turning off. Please help!

Hi ANaomi,
If you are having issues with your MacBook Pro not booting past a grey screen, and/or shutting down during the boot process, you may find the troubleshooting steps outlined in the following articles helpful:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
OS X: When your computer spontaneously restarts or displays "Your computer restarted because of a problem."
http://support.apple.com/kb/HT200553
Regards,
- Brenden

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Mac book pro won't go past grey start up screen

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