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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).