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Question: MacBook Pro Sleep Problems

I've been having issues with my MacBook Pro 17" early 09. The MacBook has worked fine until updating from Lion to El Capitan. It will not sleep when the lid is closed I've tried several methods already like resetting SMS, PRAM, and using the terminal command pmset -g assertions. In terminal it shows Idle sleep preventers: I0DisplayWranger.

Any solutions or advice would be great.

MacBook Pro, OS X El Capitan (10.11.6)

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Question: MacBook Pro Sleep Problems