Computer turning of by himself

Hello,
I've a problem with my 13 month old MBP (13 monthes means my warranty died a month ago...).
When I try to turn the MacBook on, it starts up (screen going gray, hard disc drive rotating, etc) then switch off with a pathetic "scouic" noise 4 of 5 seconds later.
After several retries (2 to 10) it starts finally up "normaly", i.e. the system boot completely and I can log-in.
The computer also sometimes switch of while I'm using it, after 15 to 30 minutes.
I've tried :
Using differents AC adaptors : same problem.
Using different RAM components: same problem.
trying with or w/out battery : same problem.
Has someone any idea for the origin of the problem, and in this case, a method to solve it ?
Thank you in advance, and please be tolerant for my poor english.
Cordially,
JD Parayre
P.S:
config : MacBookPro Core Duo 2.16Ghz
2 GB RAM (1GB Built-in + 1 GB Corsair RAM)
Message was edited by: Ti jen-tsie

thank for your help, Ricktoronto. it was actually the hard drive that caused the crash. What i've done :
1 - Carbon Copy Cloned the System on my iPod
2 - tried booting from iPod -> computer crashing
3 - Opened the computer (though part) and unplugged the hard drive
4 - tried booting for iPod -> computer booting, slowlyt but correctly.
So I think it was a mechanical or electrical problem on the hard drive. I'll perform more tests tomorrow, but i think the problem is Solved.
Thank you again !

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