Trouble starting MacBook Pro

I have a MacBook Pro that is only 3 months old and rarely used. It is not not starting up. When it is Turned on, it  Shows a white screen with a grey apple logo and a status bar that fills to approx 1/4 grey before shutting down. Any suggestions to assist would be greatly appreciated !

If the drive can not be repaired (repair disk, not permistion repair) then you probable want to reparition the computer's hard drive and re-install the operating system. This woudl erease every thing on the computer. Do you have a back up?
OS X Mountain Lion: Erase and reinstall OS X explains how to erease and re-install the OS.
If you want to try and recover information of of the built in drive before ereasing the computer, you could in thory do the same steps as erase and install, but instead of selecting the built in hard drive you could select an externaly connected hard drive.

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