HT201376 my mac shut down when it loading to acsses my account

Hye everyone i need some help!. My mac keep shutting down after it try to startup. The loading bar isnt half way full it gets completely shut down. I try to re-login back but it does the same thing all the time. I have tried to repair disk but i cant click on any button except verify disk. Half way it tells me the disk need to repair but unfortunatlly the button for repair does not apper for me to click. Is there any solution so i can turn on my mac back? i tried to diagnose but nothing happen just blank white screen appear. i tried to reser PRAM but still it doesnt help. regards fathin

Try booting to Recovery and repairing the HD
OS X: About OS X Recovery - Apple Support
If you can repair it and still problem try reinstalling the OS
OS X Yosemite: Reinstall OS X
If you can't repair it in Recovery then the disk is bad
This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.

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