I having problems with it switching on my macbook and then it automatically switches off

i have had Yosemite for a while and it was working perfectly, and the suddenly is froze and automatically shut down. I tried rebooting it it would come up with the apple logo and a loading bar e=underneath and when it loads the bar fills in with grew but a quarter from the start it it shut downs again. t is not reopening how do i fix my problem? help!!!!
I want to know how to boot up my macbook without erasing my hardrive.

Try booting into Safe Mode. If that is successful, but then a normal reboot fails, you may have some third-party software installed that is preventing boot up. If you have any ideas what it might be, we can help you uninstall it.
OS X: What is Safe Boot, Safe Mode? - Apple Support
The other thing to try is boot into Recovery and use Disk Utility to repair the drive:
OS X: About OS X Recovery - Apple Support
Finally, you can try just reinstalling the OS using Recovery. It won't erase any of your data, but you should still have a backup.

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