Late 2011 model, A1278 / 2.4 GHz i5 or 2.8 GHz i7 processor.

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Why my laptop's fan is making so much noise?

A month ago my computer started to sound very noisy, i don't know whats happening but it sounds like something stuck in my fan. I opened it and try to see if there was something but is not.

If somebody know's what could be, tell me; because it's sounds terrible!

Answered! View the answer I have this problem too

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Fans do fail. If it's a screeching sound I would replace it. Here's the part:

MacBook Pro 13" Unibody and MacBook 13" Unibody Fan

If nothing else remove it and shake it out. Canned air blown on it should make it spin freely if it's not damaged.

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