Macbook pro won't turn, and make loud noises

When I was watching a video on my 15inch macbook pro, the screen suddenly turned black and made the click sound that is usually only present in forced shut down.
I then press the power button once, and nothing happened except for another "click" sound as I pressed the power button.
I tried pressing the power button again, and again, the same thing just kept on happening.
Then I pressed the power button down and held it for 5-10 seconds and heard multiple click sounds. After that, my macbook pro successfully turned on.
However, the noise (supposedly from the cooling fans?) kept getting louder and louder. My macbook pro now functions rather normally, but the noise would never go away, which worries me a lot.
Also, I turned it off and tried turning it on again. The same thing happened. I could not turn it on by pressing it once; all i heard was the click sounds. I could only turn it on by holding the power button for more than 5 seconds (also hearing the click sounds multiple times and the loud noise)
Is there something seriously wrong wtih my macbook pro?
and can I make it so I can turn it on normally and not hear the loud noises?
thanks

You can try running the Apple Hardware Test by booting holding the D key down.
http://support.apple.com/kb/ht1509

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