My computer does not sleep when i shut its lid mid 2012 15" Yosemite

HI before and since i had upgraded to Yosemite my macbook  pro mid 2012 15" has not gone to sleep when i shut my lid i have tried to reset to default in the power settings but that didn't do anything any thing els i could do?.

Make sure that iTunes is not running, print que is cleared and no dvd disc is in the super drive.
Computer should not sleep if Internet Sharing is to work.
System Preferences > Sharing > Internet Sharing
http://support.apple.com/en-us/TS5357
http://support.apple.com/kb/TA22350

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    I resolved my issue in a very unlikely way. In my earlier post I mentioned that I wiped my hard drive and was starting from scratch. Well I reinstalled windows 7 through bootcamp and it fixed my sleep issue. That's right folks...Windows fixed my mac. I think that it was an EFI issue. I think this because windows 7 uses EFI and during installation it must have reset the sleep values to normal. I feel when you reinstall Mac OSX the EFI partition on the drive should get wiped and reinstalled as well. I also feel that apple should have an option within System Prefs for the user to select what the way is that the computer responds when the lid is shut instead of the ritual of trickery and problems that the clamshell mode can cause.
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