Sporadic power failure to my 4 week old imac 2ghz intel core 2 duo

sorry i am a noob, i have recently been having a problem with my mac just turning itself off. i happens out of the blue when i am only running menial tasks such as watching videos or browsing the internet. its not a problem with it restarting it just plain turns off as if someone has pulled the plug. if anyone has any suggestions or is experiencing the same thing please help.
thank you in advance.
jambon

Welcome to Discussions, but yoyu should post to the intel forum http://discussions.apple.com/forum.jspa?forumID=1110 where you will get an informed answer,
Miriam

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My soldering skills are, sadly, poor.
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