Macbook Pro freezes, shuts off during startup

My Macbook Pro sometimes freezes and when I try to turn it on again it shuts itself down during the startup.
A couple of days ago my Macbook Pro (15 inch late 2011 with Yosemite) froze and I shut if off by holding down the power button. When I tried to turn it on again a grey screen with the Apple logo and a bar showing how much it had loaded showed up. It loaded about halfway through and then the screen turned grey and my computer shut itself off. It then turned itself on again and the same thing with the grey screens happened and it turned itself off. It continued like that until I forcefully turned it off. After awhile I managed to turn it on in Safe mode, I did a backup and shut it off for the night. The next day it worked fine. Today the same thing happened again.
I remember before it froze for the first time and I shut it off a window came up that said something about a problem with the graphics. I was using Safari at the time. This time I was typing my password to log in.
Does anyone know what the problem is, and how I can solve it?

hanna.su wrote:
I do that by holding down Command and R when I start it, right? My computer is working fine right now, do you think I should do what you said now or wait until next time this problem happens?
You can do that now. You cannot do harm to your MBP by executing this procedure.
Ciao.

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Macbook Pro freezes, shuts off during startup

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