Removing power cable shuts off ibook G4

in Genius Bar edited January 2014
hey, i've seen this problem about on the internet many places but haven't found any real solutions... have had the laptop 4-5 months... need help ! if the laptop is plugged in to the cable everything is fine and if it runs on battery, it is fine. however when it is running off the adaptor and i remove the cable to run it off the battery, it shuts off.

please help. thanx !
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