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According to pg. 45 in the owner's manual, you turn Keylock function ON by holding down the ENTER key on the projector for about 5 seconds while the projector is being turned on.
To take the Keylock off-- Hold down the ENTER key on the projector for about 5 seconds. If the projector is in standby mode, you can release the keylock by holding down ENTER and STANDBY/ON keys simultaneously for about 5 seconds.
the colorwheel may be bad. if it doesn't spin, the lamp won't strike. if the colorwheel is ok, replace the power supply/ballast. you can get one and do it yourself, or send it to a sharp service center. either way, try www.avsolutionsny.com. they're really good.