Projector will not display laptop image. The first thing you should always try to do is make sure that the power on the projector is on first and that your laptop gets shutdown properly at the end of the day. If the projector is on first, the laptop will recognize that it is connected to a projector and usually automatically use it as a display.
If not, you could try this trick. On most laptops, there is blue lettering above the keys on the keyboard. This denotes alternate functions of those keys. In order to use the alternate functions, you must find and hold down the key that has the blue FN letters on it.
The alternate function key that we would like to try looks like two squares, one larger than the other. Hold down the blue FN key and simultaneously press the key with the key with two squares above it. Each time, you should notice the displays rotate from the laptop's LCD display only, the Projector's display only or the combination of both.