MBP won't sleep when shutting lid

For about a week now, my Macbook Pro won't go to sleep when I close it.--It stays running, and gets hot.
However, using the power button to put it to sleep or choosing sleep from the Apple menu works fine.
Any suggestions?

This issue has been covered extensively in Macfixit.
I would make sure though that you aren't running any applications in the background or have any third party peripherals connected when you close the lid. Make sure also the Energy Saver System Preferences Options has Wake from Sleep for administrative access unchecked. It is found in your Apple menu -> System Preferences.
If you find that you aren't able to stop it from happening, make sure your firmware version gets up to date, and your hardware test tests fine:
http://docs.info.apple.com/article.html?artnum=303880
http://docs.info.apple.com/article.html?artnum=303081
Regardless of the Hardware Test results, call AppleCare:
http://www.apple.com/contact/phone_contacts.html

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http://support.apple.com/kb/HT1411
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MBP won't sleep when I shut the cover.

New behavior. ?

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Apple Portables: Resetting the System Management Controller (SMC)

MBP won't sleep when closed?

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IBook won't sleep when lid closed

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Hi skywriter,
Welcome to the Discussions.
Has the iBook's case ever been opened? There's a magnet on the bottom side of the top case that activates the sleep switch. Hold a small magnet on the right side of the screen and see if it will sleep. If it does, the magnet isn't where it's supposed to be and will need to be replaced.
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MacBook Pro won't sleep when charging

My 15" i5 MacBook Pro won't sleep when charging; a reboot of the machine solves the problem temporarily, but it always recurs. When I close the lid and listen carefully, I can hear hard drive activity; the drive sounds like it keeps spinning up every 10 seconds or so.
This is not an issue when trying to sleep when running on the battery only. Any advice?

I don't have launch2net installed.
I'm not sure how this will help, but here's the last 5 lines from Console:
11-07-13 5:19:46 PM          Butler[156]          cache: adding applications...
11-07-13 5:19:46 PM          Butler[156]          cache: adding addresses...
11-07-13 5:19:47 PM          Butler[156]          cache: categorizing...
11-07-13 5:19:49 PM          Butler[156]          updated abbreviations cache (enabled)
11-07-13 5:19:58 PM          SIMBL Agent[133]          warning: failed to get scripting definition from /Applications/Utilities/Console.app; it may not be scriptable.

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Nope, reset the SMC.
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Stop macbook sleeping when shut.

Hi ive searched around but have not found an answer. Does anyone know if there is a way to stop the macbook automatically sleeping when the lid is shut.
Cheers
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Like you, I wanted to be able to close my Mac's lid and have it keep running but I also didn't want to install low level software that might cause unforseen problems immediately or down the road. I found a solution on the internet where it explained you can interfere with the magnetic switch that triggers sleep. All you need is a flat piece of steel. I was able to make a square piece about 30mm on a side that I covered on both sides with felt. If you place it on the palm rest near the edge above the Kensington security slot, it will block the magnetic switch sensor and the Mac keeps running with the lid closed. Not for everyone, but I thought I would add this suggestion to the pile.

MBP won't sleep when shutting lid

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