mbp doesnt boot when cold (temperature)

Hi,

I have searched the web but I find no clue to this problem: My MBP 17'' mid 2009 doesn't boot, when it is cold (cold room). I manage to restart it, if I heat it up with a hair-dryer. Then I can initiate a boot, that avorts. Doing this several times and going each time a little bit further in the booting process, the mbp finally boots completely and is then working for hours without problems.


Does anyone have an idea what could be the problem and how to fix it???

 

I have changed the battery recently because I thought that it was a battery problem, so it is not the battery. When I put the mbp to sleep i can't "wake it up" again when I wait too long. I suppose, that it gets to cold in the sleep modus...

 

It could be a problem with cracked solfer joints, i thought too, but how to explain that shutdown is happening in half a second, much faster than usual. And on reboot the wheel on the grey or bluescreen is always turning for a very long time (from 5 to 10 minutes)?