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Apple released the MacBook Pro 15" Unibody with a new aluminum upper case machined from a single aluminum block.

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Why doesn't the new fan work?

I installed the new left fan in my MacBook Pro 2010. The old one made a lot of noise. The connection seemed fine when installed. But the new fan doesn't turn on. Any ideas on why?

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First thing to check is if your new fan works, do you have access to a known good fan? Often the replacement part will be faulty. Order a new one and test, if the problem persists we can begin to diagnose further

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Down load this app so you can see whats happening: TG Pro. If you buy to full version you can rev up the fan to test it. Is it working?

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Dennis Helsel will be eternally grateful.
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