In some such equipment, there could be a problem of overheating of some component or assembly and due to overheating, there might be some sensor which is as a safety measure keeping the equipment off. I had seen some such equipment which stopped working when overheated but worked again when the temperature was normal. My experience belongs to the time when there was nothing like shutdown and we had to manually off the overhead projectors. Anyway, one can check for excessive heating at places and then doubt a particular part of the projector which may require replacement.
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