Assuming that you have all the connections between the laptop and the projector already performed, you should check in you laptop's manual what is the key combination necessary to switch between normal mode and presentation mode.
For instance, some Dell laptops need you to press the function key (key marked with Fn in blue) and, while keeping it pressed, press also the F8 key (marked with CRT/LCD in blue) to cycle between the options.
Some HP laptops will need you to do the same operation, but now using the function key and the F4 key, to select between "Computer only", "Extended (dual) presentation mode" or "Projector only" modes.
If even with these indications you are still not able to make your laptop show its information through the projector, please send us more details on how you connected your laptop to the projector, as well as the brand and model of your laptop.
Hope this information can help you!
Make sure you try it using the RCA or the R232 port rather than the USB port. At least on some Viviteks the USB port is not used for input.
"The USB port is not in input port. This is used for service only. Please use another input port such as RGB input. Regards, Vivitek Customer Service"
Hope this helps.
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