Sleep option grayed out after apple update

Hello,
We have had several issues over the past few weeks where about a dozen macs (Macbook Pros, Airs, iMacs, Mac Pros) have all had the same issue, and vary in OS as well; from 10.7.5, 10.8.5 to 10.9.2. They have all updated recently with Apple's new updates. Since then, the sleep option on the Macs have been grayed (greyed) out and it will not sleep or go on screensaver if left on. We want to avoid the burning of an image on the LCD screens.
I've reset the PRAM on a few to see if that will solve it. No go. I read online that manually updating some plist files would fix it or deleting them, and nothing. We need an answer quickly, users are complaining that their macbooks are heating up incredibly, and others feel like they were about to "burst into flames".
If anyone out there has had the same issue and fixed it, please advise.
Also, don't say "Just reformat and start all over"... we run a large business and need a systematic fix, not a bandaid. We are talking also about a dozen (and growing per day) computers having this issue. I am guessing we are not the only ones.
Thank you.

I know this is pretty old but there is an apple article that tells you how to fix this.
sudo pmset -a disablesleep 0
Do the above in terminal and as long as you have credentials to do so you will reenable your sleep.

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