Dell 2200MP Safety Instructions page 31

Video, S-video, Component-I). Use this advanced feature for preliminary self-diagnostic
on your projector when encountering the display problem for video.
After turning on the projector, press "+" and "-" buttons on the control panel
simultaneously and release the buttons when screen goes blank.
Contact Dell if the projector doesn't enter diagnostic mode or if the colors are incorrectly
displayed.
Press "+" and "-" buttons again to exit the diagnostic mode.
While 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.
Noise made when turning projector upside down
This is normal. This feature inside the projector allows for proper cooling in ceiling mount
applications.
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