My MacBook Pro shuts off during startup

When startup the apple logo appears, a spinning gear, and a bar partily filled(10%)
The bar disappears then reappears and disappears when the bar disappears the MacBook Pro shut off
(Haven't updated macbook since bought in 2011)

Yimajatl,
boot your MacBook Pro from your grey Mac OS Install DVD. When the desktop appears, select Utilities from the menu bar, and then select Disk Utility. On the left-hand side of the Disk Utility window, select your internal disk’s boot partition (typically called “Macintosh HD”). On the right-hand side, press the Verify Disk button if it’s not greyed out; if it is greyed out, or if it reports that errors were found, press the Repair Disk button. Once the verification/repair is completed, exit Disk Utility and select Restart from the Apple menu to restart in normal mode. Are you able to reach your login screen now?

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Macbook pro shuts off during startup

First I came back to a flashing folder with a question mark in it. I shut down my macbook and tried to start it. It goes through the chime, the grey apple, the spinning gear then the screen goe black and it shuts off.
I have a macbook pro mid-2010 model.
thanks for any ideas how to solve this.

Hi Tewfik,
Welcome to the Support Communities!
The article below may be able to help you with this issue.
Click on the link to see more details and screenshots.
A flashing question mark appears when you start your Mac
http://support.apple.com/kb/ts1440
Cheers,
- Judy

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Reinstalling OS X Without Erasing the Drive
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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?
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My MacBook Pro shuts off during startup

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