Macbook pro 2011 won't sleep

Hello there,
I have noticed recently that my early 2011, 15" Macbook Pro no longer goes to sleep when I close the lid, or when I select sleep in the Apple menu. When I close the lid or select sleep, the screen turns off, but I am still able to hear the fans spinning. Also, the white led on the front of the laptop does not pulsate like I usually does when asleep. I have also noted that when I close the lid, and then open it again later, the screen comes back on briefly and then goes blank. I have to push the brightness controls to get it to come back on. There have been a couple of occasions where the laptop does sleep properly.
Any help would be greatly appreciated
Many thanks

It is more then like a program running in the background that is causing it not to go to sleep. Or it could be corrupted OS file/s.
It's hard to tell without having the machine in front of me.

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^_^

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Macbook pro 2011 won't sleep

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