Help! Macbook Pro won't power up!

Hi, I have a new 2011 MBP 15" (1.5 months old).
When its up and running it works fine, and I'm able to shut down and restart it normally. As soon as I leave it off for more than a few hours (usually this happens overnight when I shut down the computer before going to bed)
The next morning the computer won't power up at all. When I press the power button I can hear something whirring/spinning and then 3-5 secs later the power just cuts off. The screen doesn't even light up, I don't get to hear the apple chime at all. Repeated attempts to power up the system get this same result.
I suspected it was due to cold weather (winter in Perth now). I find that every cold morning if i warmed up my macbook placing it near the heater, it will be able to boot normally after it has warmed up. But if ever the machine gets a chance to cool down, it goes into a coma? This happens when I put the mac to sleep and am away from it for more than an hour, it won't wake up!
This is so dissapointing to come from a product that comes at such a premium price. I hope I can get some help on this! It's really really frustrating.
I am reset the PRAM and SMC several times and they dont seem to do the trick. I ran the apple hardware tests, even in extended mode and they all detect no problems. Hellpppp

How cold is cold where your MBP is? In any case take it to an Apple store or AASP. If none availanle call AppleCare.

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