Ibook g3 wont always charge

I have a very odd problem. my ibook g3 refuses to charge about once every 5 days. then i have to let it die and it usually picks up again in about an hour to a day. my lcd is cracked but i dont think that has anything to do with it

Have you tried resetting the PMU? The PMU (Power Management Unit) has control over the charging function, so resetting it may help.

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