My macbook pro shuts down when I turn it on, its fully charged but shuts down automatically when I turn it on, how do I solve this?

I have the older 2008 version of the Macbook Pro and since Friday when I closed it and opend it again the screen wouldn't come back on and I'd have to press down the power button and restart the machine again completely. Then when I turned it on it would sound like its powering up but after three seconds it would make the bleeping sound and shut down again, its fully charged and I have taken the battery out and put it back in but nothing is changing, is there a way to solve this problem?

Check this article http://support.apple.com/kb/HT1547 and this one http://support.apple.com/kb/HT2341?viewlocale=en_US
If it sounds like a RAM issue it could be one of the RAM chips has failed. You could try removing the RAM one at a time and see if it starts with one still installed.

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