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Check your owners manual. This means that the air filter needs to be cleaned or that the projector has become too cold. My guess is the first one. The owners manual has instructions for cleaning or replacing the air filter :)
if it's an xr-32x (as it shows on this pic), it's a dlp projector, not an lcd. therefore no green filter. it has only a colorwheel and a dmd chip to affect the color. if it's not an xr-32x, and it's an lcd projector, replace the green filter. sharp sells the parts for the optical engine. but if it was your service tech that did it, have them replace it.
OK, let me throw out some possibilities. Most projectors how a built in lamp and filter timer. This lets you know when you need to clean your filter or replace your bulb. If left unchecked some models can prevent you from using the projector til the maintenance has been resolved. Clean your filter and refer to your owner's manual for how to reset the timers. If you still get the blinking or red lights after you have reset the timers then you may have a bad bulb or the contacts in the lamp assembly are tarnished or corroded. Pull out the lamp assembly and make sure the leads to the lamp are tight now take a small knife and scratch the metal contacts that the lamp assembly uses to connect to the projector. Clean them well so they will make good contact. Reinsert the assembly, close the case, and try it out. If you do not know how to take out the lamp then refer to your manual as it will have detailed instructions. If your projector still does not work then your lamp is bad and needs to be replaced.
Here is the manual: ScreenPlay 4805 ScreenPlay 4805 Check page 38 on picture settings, you can revers the image to project from behind a screen (mirror), I don' think you can have picture upside down (180 rotation) using projector settings. You need to reverse image source (eg. picture on computer).