Most likely a bad cable. Try bending a little bit of the wire at a time and see if the color flickers back to normal, or you could just by another cable and see if that fixes it. Happens to a lot of the projectors I support.
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You need to change the input source for where you are plugged into. My guess is that that you are getting audio because you have not matched the right video with the right audio pair on your projector. You have a blue screen so I know it is not the lamp.
Lamp LED should be lit when the projector is in Standby. However, the problem you are describing sounds like one of two issues. Either the lamp is bad and needs replaced, or there is a power supply fault. If you have tried replacing the lamp already, make sure you reset the lamp counter or the projector may still not function properly.
does the temp warning light come on when the projector shuts off? if so you may also try cleaning the air vent filters and ensure there is proper air flow around the projector. if that checks out then have the projector serviced as the power supply is likely suspect.
the light filter on the blue lcd panel is fried due to excessive dust and heat. clean out the projector with canned air. unfortunately, you cannot buy individual parts of the optical engine- you'll have to replace the whole thing. or live with it.
You didn't put your 3-D glasses on backwards, did you? :)
Seriously, if you are using the component inputs, be sure the three cables didn't get mixed up when you put the projector back. Otherwise, you might have an issue with the color wheel inside the projector, but I doubt it.