I have a mac book pro still running mountain lion.I haven't powered it on in a few months. now when i try to turn it on all i get is the apple logo and the progress  bar after a few mins. of trying to load my laptop just turns off.can anyone help me

I have a mac book pro with retina,I haven't turned it on in a couple of months.no problems then, now when I try to turn it on i only get apple logo and progress  bar. After a few mins the laptop just turns off and nothing eles.any help would be appreciated  thanks

I linked to it above, but here is another link.
http://support.apple.com/en-us/HT201262

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