Cause 1 : The video source is not turned on or connected correctly.
Solution 1 : Turn the video source on and check that the signal cable is connected correctly.
Cause 2 : The projector is not correctly connected to the input signal device.
Solution 2: Check the connection.
Cause 3: The input signal has not been correctly selected.
Solution 3 : Select the correct input signal with the Source key on the projector or remote control.
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