MB pro not sleeping when lid closed

Hi, I came to work today, opened my backpack and found my laptop extremely hot in its sleeve. It appears it had not gone to sleep when I closed the lid. It then failed to run properly for about 20 minutes until it cooled down. Now it is ok, except that it will not run in lid-closed mode. I plug in my external display, put it to sleep, and wake it back up with the lid closed in order to use the external display. The display fires up for a few seconds and then turns off again. I've tried this over and over again, the computer simply won't stay on for more than a few seconds. However, when the lid is opened, it will run the external display in mirrored mode just fine. I think something is toast. Coincidentally, I had just downloaded the keyboard update 1.0 a day earlier... Anybody know why my computer is not sleeping when I close the lid and why it won't work in closed-lid mode anymore?

I've had a similar problem since I first got this a year ago. Sometimes when I shut the lid, the display does not go to sleep, and sometimes it restarts automatically when I shut the lid! I've also found it very hot at times when it should have been sleeping. So far, it's only been a minor annoyance.

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    Similar issue after upgrade w my MBP (early 2011). 
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    I found another similar post, however it was resolved by the individual reinstalling the operating system.
    My issue is more complicated. I have made sure everything is up to date, all the settings that tell the system to sleep when the lid is closed are turned on. I have even turned those settings off off, just so I could turn them back on to make sure there wasn't something quirky about it.
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    Thanks for the reply, gat0gelat0.
    Yes, those settings were the first things I checked. I also tried changing it to "Do nothing", then changing back to the sleeping option. It still does nothing when I close the lid.
    I would like the functionality of it going to sleep when I close the lid for the convenience, like when class ends, I have to rush to my next class, I just want to close the lid, put it in my bag and run to the next class. Keyboard shortcuts like Fn-F4 work, but this laptop should have the functionality I am describing, and I want to figure out why it isn't working and how to fix it.
    I suspect there is an issue with whatever is used hardware wise to sleep the machine. Either it's not being triggered, or it's not there, or it's broken. I've tried running a magnet around the bezel of the LCD screen as well as around the palm rest bezel and there is no activity as I've read that many laptops trigger sleep by interaction by a magnet. Still nothing.

  • IBook will not sleep when lid closed

    Hi,
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    Jack,
    Welcome to Apple Discussions.
    You need to give the Apple Authorized Repair center a call back and let them know what's going on. I've seen this before here on the forums, and it was attributed to a sleep magnet not being put back in. It's most likely this. Apparently, putting this magnet back in can be easily overlooked.
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  • MacBook Pro does not sleep when lid closed

    Hi there. I recently upgraded my MacBook Pro from Snow Leopard to Mountain Lion. Before the upgrade my mac would sleep automatically when the lid closed. However, ever since I've upgraded, when I close the lid, my mac doesn't go to sleep. However, if my mac isn't plugged in (running off the built in battery) it goes to sleep. I looked through system preferences and I can't seem to find any settings relating to this, does anyone have any suggestion on what's happening and how I can fix it? Many thanks in advanced.

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  • How can i get my macbook pro too stay on and not sleep when lid is closed?

    how can i get my macbook pro too stay on and not sleep when lid is closed?

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  • How can I get my MacBook to stay on and not sleep when lid is closed?

    How can I get my MacBook to stay on and not sleep when lid is closed?

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  • Computer not going to sleep when lid closed

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  • MBB Does Not Sleep When Lid Shut

    My macbook does not sleep when I shut the lid. This happened recently after I had my fan repaired. I also updated the OS at the same time, so I'm not sure which triggered the problem.
    I would have to manually select sleep before shutting the lid; and I would have to press the space bar after I've opened the lid to wake it.
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    I tried doing this fix using the guide on http://ifixit.com to dismantle my MacBook and find the battery/lid detector cable which indeed seemed loose at its connector just next to the headphone jack, but when I reassembled the mac still does not detect lid closing and now it doesn't even detect the battery anymore! Yikes! Looks like a trip to the apple store is required anyway.

  • Macbook Pro won't go to sleep when lid closed

    Hello,
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