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A lot of these have a lifespan timer for the lamp. So even if the lamp is good, it may shut down simply because it's counted too many hours. Use the two minutes of run time you have to check the menus for anything about that. They usually don't hide it, there should be a reset somewhere.
As for the fan, you should be able to feel it blowing air near the lamp. They will also have air filters for the fans, ensure those are clean.
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