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You may need to check the settings of your mac book that permits you to output the signal to an external display. Also you may need to purchase a display port adapter (VGA, HDMI or DVI) that is compatible with the input connector on the projector
You need to send your laptop signal to your projector by pressing the FN key and the key that says CRT/or an icon of a screen (this is located at the top of your keyboard). 3l toggles will give you different images. i.e. projector image only, projector image and laptop image or just the laptop and not projector image.
If you are connecting to a laptop then you may need to hold the function button down and press F1, F2, F3 etc. there should be a sign with the latop on there and a sign with an external device (monitor,PROJECOR)
hope this information was useful to you.
The problem is with the computer, not the projector.
There are special function keys, generally with blue lettering along the top row of your keyboard. Find the one that looks like a double screen or says "CRT". Also locate the blue function key [FN], probably on the lower left on the keyboard.
Press, and hold, the [FN] key and press the [CRT] key to change to dual screen.... and wait for several seconds for the projector to detect it. If it still doesn't work after you have waited, press the key sequence again (there are 3 different screen settings).
1. Computer Screen only (normal)
2. Projector Screen only
3. Both Computer AND Projector screens
connect the laptop with projector and power up the projector and select the input 'computer' now start the laptop. the Projector will automatically detect the signal. secondly also chek with the display setting set to 800x600 then check with higher resolution.