os 10.5.8 black out.

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Sep 12, 2009
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this problem happen after i upgrade my mac os to 10.5.8.... while i am using my macbook, the screen black out suddenly and shut down.... i am wondering, is there a solution for this problem.... or maybe i can downgrade to some earlier version without having to format the hardisk??
please, can anyone help me???
thanks...
 

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