Its amazing after years of using laptops and projectors that they still have problems connecting. Sometimes the projectors are too smart and adjust to a laptop and then the laptop is changed and the connection no longer works. Sometimes the laptop has a different resolution from the projector. Sometimes the laptop is set up to work with a TV (into NTSC or PAL) and then cannot connect to a digital projector.
There are all kinds of problems. What amazes me is that this relatively simple problem is not solved automatically with a standard by now - after all the physical plug almost always works.
Another problem at conferences is microphones. Why is that speakers don't always realize that if they stand in front of the speakers they might get feedback? Why is it that microphones are sometimes awkward to switch on or don't work. You'd think that by now they and their connected sound systems would be foolproof.
Its amazing to me that technicians are constantly needed at conferences to plug in laptops, partly because rooms are reconfigured and not set up permanently for presentations.
How long do you think it will be before every lecture, presentation and slide show that one attends will work without a glitch?