HT1338 Shut down MacPower book not working

I cannot power off. Shut down selection is dimmed.
Window comes up stating Safari is preventing shut down.  
Safari close feature on menu is also dimmed.
Is this Malware?  
How do I shut off my computer ?

Thanks Hans,
It is not an issue with sleeping the machines, but actual start ups and shut downs.
I will try setting the preferences so that the machines never sleep, to see if there is a conflict between the sleep times and the shut down. I would rather that the machines were actually turned off overnight rather than sleeping.
The article suggests a lot of things that contribute to the machines not sleeping, and the one that jumped out at me was if the machines are connected to a network - which they all are - but that wouldn't explain why some of them shut down as expected, and some of them don't.
Unfortunately, we have students using the machines all day so there isn't a chance to check the procedures!

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