OS X :: MacBook Shut Down Randomly

Aug 4, 2010

I am using my macbook it gets hot pretty fast and shuts down. Then when I start it up it shutsdown right away. If i leave it for a while it will work for 5-10 mins then shutdown. What to do?
Specs:
OSX 10.5.8
2gb ram
nvidia 9400m

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First of all, let me give you a rundown on everything I have done: 

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[code]...

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I'm a new Mac user. A few days ago, I tried to turn my Mac Air off by clicking "shut down" as I always do.But it wouldn't shut down.Moreover, there was no indication that I had even clicked "shut down." No rainbow circle telling me to wait.Days later, I'm still trying to restart or shut down my Mac, and I can't.It's like my computer isn't hearing what I want it to do!I press "shut down" and nothing at all happens.I can, however, just resume using my Mac as usual (internet works, ITunes opens, etc.)I've been browsing forums all day and nothing has helped.

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