My Macbook wont Boot, Power Light just lights up

I am having a HUGE Problem with my macbook pro. (Early 2011). I already brought this to the mac center but they could not find anything wrong with it. They said that the whole time it was with them their technicians did not find anything wrong with it.
The problem is that it wont boot up. The last time i was able to use my macbook pro (I am using it right now since it booted up) was 2 weeks ago. Today i tried my luck since i really needed to check my files and luckily it did boot up. but before this it would take an hour for it to boot up. After presing the on button the power light will turn on and after a few minutes a whirring sound will be heard. I will then turn off the Mac and turn it on again and the booting up sound will be heard. but last 2 weeks it was just whirring sound and after i turned it off and turned it on it wont boot up anymore until now.
I am really stumped as to what the problem of my Macbook is. Any help would be really appreciated.

Go through the steps - one by one - that ds store outlines in his user tip, Step by step to fix your Mac.
Good luck,
Clinton

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My Macbook wont Boot, Power Light just lights up

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