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Is there any signal on the local monitor or the projector?
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What input are you using? Local PC (supplied in classroom), Laptop, or DVD player?
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If using a laptop, what type of laptop connection? VGA? HDMI?
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Using the Extron/Crestron control panel (could be push button or touch screen on the podium) confirm the projector button is turned ON.
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Confirm that the correct input is selected on the control panel.
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Confirm that the device connected is turned ON (PC, laptop or DVD player).