Question about Dell Latitude C640 Notebook

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Dell C640 question.

My laptop sometimes wont turn on, just the second led is blinking.What is that led mean.
I have tried to disassemble the notebook for peaces but still have the problem,and no matther when is cold or hot, so not over heating.Sometimes turn on sometimes not.And I tried with some error checking programs and just run fine.
if once turn on work perfectly.
Please help.

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