PB will not run on battery-RePost

Sorry, but I posted this under the battery and power section w/o a response.
A coworkers 12" PB will not run off the battery. As soon as she removes the power cord it shuts off. New working battery was purchased and used.
Any ideas?
Thanks

There are 3 components to the charging circuit: The power adapter, the battery, and the logic board (and within that the dc-in card).
When the battery is installed, what does it say about it in the system profiler (click blue apple, about this mac, more info, power)? What's the fully charged vs current capacity? Even though it's new, how many cycles are on the battery? When you push the button on the battery, how many lights light up?
You might have the person try resetting the power management unit (PMU), following directions at http://docs.info.apple.com/article.html?artnum=14449
If you know for a fact the power adapter is working, and that the battery is fully charged, then it's either a dc-in card problem (this is the card which has the plug the power adapter plugs into) or a logic board issue.

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