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Battery Not Present

Hi! I have an HP elitebook 8440p. The battery meter says that my battery #2 is not present and when i unplug my computer is shuts off.  I've tried taking out the battery and replacing but that hasn't worked.  I read that re-installing the microsoft ACPI-Compliant control method battery may help but I wasn't sure if that applied to my situation.  Can anyone help me?

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