My macbook randomly shuts down (2.4 intel core 2 duo 2 gb ram)

my macbook turns off in the middle of use. when the macbook is powered on the fan starts up full speed and stays that way for a while.
then 15 mins later is turn itself off in one second. what could be the problem.
thanks

This seems to be an obvious over-heating issue.
How old is this? I'm guessing it's a bit old and perhaps has the main fan obstructed with dust, etc.
Could you give us more info please? Also try to get some cpu temp apps if you don't already have one and let us know how hot it's getting.

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