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

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Wont sleep when closing the lid

My macbook pro won't turn off when closing the lid, i guess there is a missing magnet inside the computer with i found in one of my screwdrivers after a repair but i don't know where to place it. It's an small and rounded magnet. I have tried anything related to software even wiping my mac.

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Did you resolve? Likely to be the Hall Effect or Reed Switch that is situated on the left side of the laptop on my 2012 Pro Retina. The magnet on mine is in the lid. If you have had the lid apart then that will be where the magnet goes. Try placing a magnet around the keyboard perimeter and see if it goes to sleep with it in some place (others have found that putting a phone case with a magnet by the side of the laptop has caused theirs to go into sleep mode). If it does go to sleep then your mysterious magnet will be the problem. If not, then the sensor itself may be at fault

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Do you have Internet Sharing turned on in your Sharing System Preferences?

If you have it on, the Mac is set to never sleep.

There are other things you can try on this Apple Support document; but the first one I mention is not directly listed.

Apple: If your Mac doesn‘t sleep or wake when expected

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