Macbook pro unibody only turns on when battery is removed


macrumors newbie
Original poster
May 31, 2012

I have a problem with my macbook unibody( late 2009 i think) magsafe only shows faint green and will only turn on if i remove the battery.

I know the battery is at its time and needs replacement.

But as it turns on when i remove the battery why does it not when i reinstal it.
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