During a meeting, a ceiling-mounted projector powers on normally but then shuts itself off after about 10 minutes of use. Just before shutting down, the cooling fans speed up and the lamp-status LED turns solid red. The input source, cabling, and AC outlet have been verified as working. Which of the following is the MOST likely cause of the projector's symptom?
Dust-clogged air filter or blocked vents causing the projector to overheat
HDMI cable run that exceeds the maximum recommended length
Outdated graphics driver on the presenter's laptop
Projector lamp has reached the end of its rated service life
A buildup of dust on the projector's air-intake filter or blocked ventilation grilles restricts airflow. The internal temperature rises quickly, so the thermal-protection circuit turns the projector off to prevent damage. This behavior is preceded by fan ramp-up and a lamp/temperature warning LED. A graphics-driver issue or an overly long HDMI cable could disrupt the image but would not trigger an automatic power-down. A completely burned-out lamp would prevent the image from appearing at all rather than causing a timed shutdown.
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