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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.
It is probably mirroring the screens on your MacBook and the projector. If you want different resolutions and things on each screen, go to the Apple menu, System Preferences, Displays, Arrangement and uncheck the "Mirror Displays" checkbox.
Sounds like the lamp needs to be replaced.
Re your Sharp XR 30S We are able to supply replacement lamp delivered (excluding local your local taxes) for $US270 as we ship internationally and also the same with our revolutionary ICE Digital Daytime projection screens.
Regards Kevin Andreassend
ICE AV Technology Ltd
firstname.lastname@example.org +64-9-414 2348
you need an infrared receiver that plugs into your laptop to receive the signal ...honestly they arn't very reliable...go buy a targus presentation remote at staples for 39-69 bucks if you want areceiver i think i have one left