When the macbook pro starting is shutdown

I have macbook pro 2012 A1278 and i upgraded to OS X Yosemite, when the macbook is starting and the you see the apple logo for 15 seconds is shutdown.

Hello Mighdez126,
Lets see if we can get your Mac to start up again. Start with article below and go through different boot options like Safe Mode and starting up in Recovery Disk to test the hard drive. Let me know if this works for you or if you are still stuck. 
Mac OS X: Gray screen appears during startup
http://support.apple.com/en-us/ts2570
Regards,
-Norm G. 

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