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Why won't my Mac sleep/wake when I close/open it?

I got my Macbook as a Christmas present this year, used. I noticed that when I close it, it takes about a minute for it to sleep (only because I set it to sleep after a minute of inactivity). Then, when I open it, it doesn't wake until I press something. I've tried doing many things, including "pmset -g assertions" and the only thing preventing it is "com.apple.iohideventsystem.queue.tickle" but it doesn't say anything like "preventsystemsleep". Is the sensor broken? How would I fix that?

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Did it always act this way? What OS are you running, The last two releases have had a lot of sleep/wake issues.

If you have not changed the OS you could have a corrupt .plist file.

Create a new user account and use it just as a test. Does it act the same or as you expected. If the behavior stops you have eliminated a hardware problem. You can go back to your main account and try to track it down (deleting a corrupt .plist file is a "fix" for strange application behavior).

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It stayed the same way

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Try the clean install as below, ''If you've opened the box you may not have the ''sleep magnets'' aligned.''

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I had the same problem. After spending 2h with the apple care hotline I had to do a clean install. But then it worked. Just make a time machine backup before hand in order not to lose date.

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Most likely cause is an idiot who replaced the screen and messed up the sleep magnet. Second most likely cause is a liquid damaged BIL.

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