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AVPartner.com Tip: Is the image from your laptop not being displayed through the computer projector? First, check to make sure everything is connected correctly and turned on. If so, it's likely you need to do a keyboard command for the computer projector to work. Meanwhile, a lot of computers simply require that you follow standard operating procedures when connecting a new piece of hardware. Typically, with most laptops, if a computer projector is attached, the computer disables the internal LCD. If you follow a standard operating procedure of the laptop, you will need to attach all the cables first, then turn on the computer projector and finally the computer.