Macbook keeps turning off and won't turn back on easily

My Mac keeps turning itself off randomly. This has been happening for a while now but it is far more frequent- perhaps once a day. It turns off during use and when I attempt to turn it back on it for some reason it makes a strange noise and wont turn on for a long time. I am unsure if this is because it needs to cool down first?
It is a Mac os x (10.6.8)13" if this helps?
If anyone knows how to fix this I would be truly grateful!!!

Try resetting the SMC. If that does not help, take it in for diagnosis. There "appears" to be a hardware problem, but it would need to be tested to determine the cause.
Barry

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