I'm no expert....BUT...I had the same problem. I was told to use the FN (function key) and F5 to swith the display to include the projector. Seems that in bootup, the 'setting' for CRT and/or secor\ndary screen (projector) is not active, but as soon as windows is loaded, the setting kicks in, and may leave your projector screen with no signal. SO try toggling with FN+ F[whatever key your pc uses].
It definitively sounds like either a Screen resolution or a Screen Refresh rate problem. I would suggest you start at the bottom: set your Screen Resolution to something very low like 800x600 and set the Refresh rate to 60Hz - both in Windows of course - you'll probably have to do this with you regular display attached to you PC first, then connect your BenQ second. Than move your way up to the recommended spec in your BenQ User manual.
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1st of all you need to connect the projector with your laptop turned off. One the laptop has finished booting and loading windows. Hit the Fn+f4 or f7 key to switch between the displays then you will get the display.
But if this also does not give display then you can check with the projector with Video INPUTS (Eg. Input 1 / Input 2 etc.,)
In most cases this problem is cured by enabling the external VGA (or monitor) ouput on the laptop. The quickest way is to reboot the laptop with the projector turned on and connected. Usually the laptop will detect an external display is attached and enable the port.
It is also possible to manually enable the external display port. It varies from laptop to laptop but look for the "Fn" key at the bottom left of the keyboard, usually coloured green or blue. You should see a row of icons on the top row of "F" keys which is in the same colour. Look for the one which is either a monitor, or possibly says LCD or CRT.
Hold down the Fn key and press the key you located in the last step. There is usually a delay of a few seconds and then you'll find something may happen. Usually the external output will be turned on alongside the local (laptop) display. Repeatedly following the last step cycles through all available configuration options, including both on, local on, local off, external on, and external off.
This should fix it. Make sure that the correct input is selected on the projector whilst doing this. It will be labelled on the projector and it should display the same input message on screen.
Usually the key combination is 'Fn' (function Key) + F4 (or which ever F key that displays the symbol of monitor on it). This key combination is used to toggle the display between monitors.
Please come back and vote for me if this turns to be helpful for you.
When you say doesn't boot up, are you sure you here no noise at all? I think that all you need to do is to switch the laptop back to it's on monitor. The Benq swapped the monitor over to remote monitor, and you're going to have to switch it back. Hit and hold the <FN> (Function Key) plus hit the <F6> key. That's the function key F6. You may have to hit a couple of times depending on the computers settings, but make sure you give the screen about 5 seconds to reset it back.
I think that should do the trick, if not let me know,
The video output will automatically switch to the data projector first when you power up the data projector first and then boot up the laptop.
When you power up the laptop first you can toggle the Windows image between the LCD screen and the video port/data projector by pressing the Fn key plus the F4 key. Pressing these keys each time will switch the display from LCD screen to video port only, to both LCD screen and video port, and back to LCD screen only.
on your display properties, switch windows to appear on your laptop. and do not connect your LCD when booting your PC. there is an option in display property that says extened your windows to this display... that is your LCD.
First find someone you know who has a working unit, just to make sure you don't have a problem with your PC output or the cable so you KNOW you have signal at the input.
If no signal then, make sure your input is "configured" correctly in the user menu.
I would have to think your VGA input board on the projector is faulty but let me know what you find.