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MacBook Pro models with a 15" display

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Why won't my MacBook turn on.

I have a mid year 2010 mac book pro that I just replaced the battery on. It worked great the first day but now it won't power on at all. What could be the problem?

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You have to look at what has changed, and what has changed is that you have installed a new battery. I would remove the battery and see if it powers on via AC adapter. If it does, you know what the problem is. I wouldn't normally expect that a battery would cause a laptop to not power on, but occasionally they can cause odd issues, especially with 3rd party batteries.

If it still does not power on, we can go from there.

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