The EX240U uses a DLP imaging chip and a rapidly spinning six-segment color wheel (red, blue, green, white, yellow and cyan) to form the image. It is likely that the spinning color wheel has stopped with the red filter in front of the chip. I recommend opening the projector and see if you can coax the wheel to move and maybe it will spin once again. if not, it may be the wheel motor or the circuitry that affects the timing of the spin - either way, it will take a trip to the repair shop to fix.
Hope that helps.
After turning on the projector, press "+" and "-" buttons on the control panel
simultaneously for 3 seconds and release the buttons when screen goes blank.
2 Press "+" and "-" buttons again to exit the diagnostic mode.
3While in Self-diagnostic mode, the screen will run a seven-color-cycle test as
following:
Red--> Green--> Blue--> White--> Watchet Blue--> Dark Green--> Yellow.
Ensure that the colors of the test pattern are correct. Contact Dell if the colors are
not displayed correctly.
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