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Our projector shows a blue background and does not seem to be connecting to the computer

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Several things to check.
Make sure both the input selection on the projector is for PC and make sure the PC output selection is for the external output, as in an external monitor. The PC does not care or need to know that the external output is a monitor or projector.
If none of these works, try a different cable and output on both the laptop and projector ie, Switch from PC output to a DVI or HDMI.

Posted on Nov 22, 2014

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1 Answer

My projector has lines on the screen. new bulb didn't help


If this projector is connected by Component Video (3 or 5 wires) instead of HDMI, the most common color related problems are caused by having one of the 3 video cables (Red, Blue or Green) with a bad connector. If everyone is a green smurf the problem is with the red cable. If everyone is a red smurf the problem is the blue cable. If the green was bad you wouldn't see anything.
Another possibility is if the green is plugged into the yellow jack instead of green jack on the projector, you could see what you are describing.
If everything checks out, take the projector to a repair facility.
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