MBP turns itself off just 2 seconds after I turn it on

Hi,
Since yesterday my 15" MacBook Pro (older model)cannot boot. When I turn it on, I hear the fan starting, the white light lits up, and after 2 seconds (hence before the Mac startup sound), the laptop turns itself off! With this same typical sound on the left hand side corner as when you force it off by pushing the power button for 10s (which I didn't do here).
I've tried the recommendations on the help page http://support.apple.com/kb/TS1365?viewlocale=en_US. I've also checked if the RAM was properly in place. And of course, I tried with and without the MagSafe and the battery.
When I turn the MacBook Pro on and keep the power button pressed, it stays on for like 5 seconds, until the white light flashes 3 times, then after another second or so, turns itself off again.
What's going on?
Thanks!
Tibo.

Hi T,
IIRC, the three flashes (used to be beeps) indicates bad RAM. Do you have any other compatible RAM available to try?
Message was edited by: tjk

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Hello!
The short version: my MacBookPro (technical details below) switches itself off sporadically and nobody knows why!
The long story now: In July this year began my MacBookPro began to switch itself off. Due to the fact that this happened first while using Aperture 3 I thought that the problem was Aperture-related. It wasn't, the MBP did this after this first failure also while using other programs, even then, when Aperture was not open in the background.
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From MacBook Pro: Care, Use, and Safety Information
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Hi T,
IIRC, the three flashes (used to be beeps) indicates bad RAM. Do you have any other compatible RAM available to try?
Message was edited by: tjk

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Update: I uploaded my video to youtube, please comment:
http://youtu.be/3PNLUYd8g7A
TIA and pardon me for my English.
I posted this originally at another forum, and somebody suggested me to post it here as well, to get more help.
Long story short, I purchased a brand new Canon 6D from B&H on Oct 24th, 2013. From early december, the camera starts to shut itself off randomly and displaying empty battery. I found the camera constantly shuts itself off after 20 - 100 continuous shots with a FULLY charged battery (right off charger, showing 8.23V using multimeter, and showing 98% in battery info).
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"The camera usually shuts itself off after 20-100 continuous shot, ..."
By this you mean your are in continuous drive? You just hold the shutter release down until it stops shooting?
"... the shoulder LCD shows a ..."
What is the "shoulder" LCD?
Sorry for the extra questions but I am trying to understand exactly what you are going through and why Canon said it is OK.
Canon did not say it was all right if it is not.
You are, also saying, if you use the camera, just for a single snap shot, say several in a session, it is OK? Right?
It only shuts down when on continuous drive or video?
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EF 70-200mm f2.8 L IS II, Sigma 120-300mm f2.8 EX APO
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MBP turns itself off just 2 seconds after I turn it on

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