I'm a administrator of a lab with 40 machines.
Sometimes, mainly at night, the students forget to shutdown the computers after the classes. So computers remain a long period (weekend) with the power on, heating the room and themselves.
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Adriano.
That is valid.
Are classes in session or are computers accessable at off hours?
If not, then run a cron job at times when the computer isn't/cannot be used that will just shutdown at that time.
I also see an issue with the monitors being on as well.
-- Robin Laing