My Macbook Pro won't charge when it's on, only charges VERY slowly when it is shutdown

My Macbook Pro won't charge when it's on. It only charges VERY slowly when it is shutdown. Recently when it was charging shutdown, I could not get it to turn on. The only way it turned on was by removing the charger from the Macbook Pro. This only happene one time but still wondering what is going on with this battery.
Thanks for the help!

First see the MagSafe troubleshooting tips:Apple Portables: Troubleshooting MagSafe adapters and check to see that all looks ok.  You might want to try using another charger in case the charger is faulty.  If that doesn't help, take the MacBook Pro and charger to an Apple store genius bar and have the technicians test the system to see where the fault is.

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