Switches off after startup load

Hi there!
Once I switch my 2011 MacBook Pro on, the grey screen appears and the apple logo with the loading bar. Once the bar is fully loaded, the computer switches itself off. I cannot move from this grey screen because it's constantly doing it.
The operating system is OSX 10.9, and had a new hard drive installed in february.
Thank you!!

Hello alicefromtamworth,
The article linked below details a number of steps that can help get your MacBook Pro to startup successfully.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
Cheers,
Allen

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