There are dozens of models of BenQ video projectors, designed for a number of different purposes and applications, but there are a handful of common problems that have similar solutions. The steps here should resolve the most common issues encountered by users of BenQ projectors. If your problem persists after trying these steps, contact BenQ customer support.
Make sure the lens cap has been removed. It may be embarrassing, but it's an easy thing to forget.
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Check the power switches on the projector and power bars. BenQ projectors have power switches on the back, in addition to their "on/off" buttons. One might have gotten bumped into the "off" position.
Check your connections. Unplug, then firmly reconnect, any power cables and video cables attached to your projector. Check both ends of the cables.
Check how many hours your projector lamp has been in use. Projector lamps tend to become dimmer with age, and eventually stop working altogether. You should replace any lamp with more hours than its recommended lifespan.
Try swapping out your power and video cables if the projector still isn't turning on. Replace them one at a time to isolate the problem.
Make sure the projector is set to the correct video input source.
Make sure your video source is outputting a video signal that your BenQ projector can process. Many computers and game consoles can produce higher-resolution images than some BenQ projectors are capable of displaying.
Adjust the projector's video settings if the picture is blurry, too dim, too bright, has poor color or is shaped oddly. Blurry or poorly colored images can sometimes be fixed by adjusting the projector's focus, contrast and color saturation settings. Dim images can be improved by adjusting the projector's brightness. Change the projector's "keystone" settings if you're getting a trapezoidal image.
Try repositioning the projector. Make sure it's parallel with your screen and at the right distance from it. Different projectors work best at different ranges; the manual includes fairly detailed information on the correct distance that your projector should be.