Blue/Pink or Green screen

Hi. I have a number of 3000 Series C100 lenovo laptops. Of late, when being used by my students, all disappears and you are left looking at a screen with either a bluish or pinkish tinge. Only way out is to force a restart.
After doing this the laptop will function normally for quite sometime (2-3 weeks) then do it again with out warning. I was wondering if this was an overheat problem. Laptops are being run without battery installed as they are connecting to mains supply.
About 6 of the 14 laptops in the suite have begun to experience this problem.
Help pls.... very frustrating.

Check: Settings>General>Accessibility>Invert Colors>Off.

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