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Did you try running it without the battery attached and just on the power adapter, that part wasn't clear.. If so, and it's still a no-go then...
If it's not the battery, or the charger, or the connection between the motherboard and the charger... That leaves the charging/power circuit on the motherboard, and if that isn't a seperate unit from the motherboard then it's time to buy a new motherboard or a new laptop. It sounds like you've replaced just about everything that is easily replaced.
Good Luck, and if you feel I have fully answered your question, please click "accept".