My mac reset over and over agian

Help me please I use my Mac for work. I have this problem with my MacBook Pro that when I turn it on a apple logo pops up with a white background and under the apple logo a grey bar pops up and load once that bar is finished loading my MacBook Pro shuts off and when I turn it back on it repeats the same process over and over again I need help before vacation is over please. ever since i got yosemite

Try booting in Safe Mode
OS X: What is Safe Boot, Safe Mode?
Next try booting to Recovery (Lion and later) and repair the startup disk using Disk Utility
For earlier OSX version boot from install disk
Next reinstall the OS

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