Macbook wont power on with AC power but Will with Battery

when i try to power on my Macbook it shuts off immediatly if i use AC Power but if i unplug the Ac Cord and use the Battery it does power on
Battery has an X on the display
i took it to the genius bar a few days ago and the tech took off the battery,held down the power button for 30 seconds then re-installed the battery
this corrected the X on the display for ONE DAYthen it came back
any idea what the problem is
and are both of the above things related?

sorry wrong post, please ignore. too many threads with similar issues.
Message was edited by: drupii

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Macbook wont power on with AC power but Will with Battery

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