Probably unrelated, but some of our XP machines
turn on the screen (after it turns off from
inactivity) and keep it on for no reason. Not all
the XP machines, just a few. Dell laptops.
So something unknown convinces them that there's
activity when there isn't.
I overcome it by shutting the lid almost all the
way so that the screen turns of on some internal
screen power switch.
All the machines are powered up 24/7 so it's best
to keep the screens dark where possible.
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