>>Are you sure his laptop is set for resolution that the display will handle?
>
>With my laptop, which is at 1280, just switching mode adopts it to 1024. So, the projector is capable of up to 1024. With the Acer, when I thought about that, assuming something wouldn't be able to adjust, I switched it to 1024 and retried. Nothing happens. It doesn't seem to be related. The reason I am saying that is that nothing even tries to work. So, that is why I think there is a setting that is locking this to his laptop only.

Look in the display properties on the Acer. See if it has an External monitor, and make sure it is enabled if it does show one.