I recently bought a 2010 MacBook Pro, it powered on and charger worked as well. I pulled one of the two hard drives with in my other laptop. when I tried to power it on nothing happened. So I figure it needs to be charged, plug in the charger there is no light, and the battery indicator on the side isn't showing anything either, the power from the battery to the laptop is plugged in. I have two of the correct chargers, and they both work on my other MacBook Pro. If any one could tell me what could have happened between the time I switched hard drives and now I'd apriciate it.