Make sure the projector is on HDMI. Hit the HDMI button on the side of the projector or on the projector remote to make sure that that input is set to HDMI.

Video on how to focus and adjust lens.

Yes, we have some videos to help you with setting up and taking down the Digitarium.

A playlist can be found here.

Yes.

D1 is an older system, but with an updated software that has more features.

D2 is a newer system and has the speakers inside the computer housing instead of having to hook them up externally.