3200MP Connection question

I posted this in the first time users group and someone replied and suggested I post it here, so here it is. We have a Dell 3200MP projector where I work and it works fine with an Inspiron 5100 laptop, but when I try to use it with a Latitude D505 the projector never finds the laptop. It works with some other laptops, but not with the D505. Does anyone have any ideas as to what might be going on and what to do about it. I make sure that the projector is on before the laptop, but that doesn't help.

Thanks,

   WCDoan