My macbook gets stuck while starting, please help

I bought a new macbook pro last januari and it was working very wel. I had no problems at all.
The last days i kept it on or let it hybernate, but i didn't really shut it down for some time. Today it seemed slow, so I decided to restart.
I turned it off correctly, but when i tried to turn it on it doesnt get any further then the gray screen with apple logo and turning waiting sign. I waited almost 15 minutes, but no change.
I tried restarting a couple more times but every time the same result. So I get the startup sound and logo, but then it seems to get stuck.
Is there anyone who can give me any advise on what to do now?
Thanks so much!!!
Suus
p.s. I have a mac OS X, but not sure which version...

That's called the Gray Screen issue and it's cause is most likely a third party kext file that loads at boot time, or it could be a corrupted drive or OS X.
I've written a tutorial here to how to go about fixing it
Gray screen at boot, spinner/progress bar

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