3200 connection problem

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. I make sure that the projector is turned on before the laptop, but still no connection. Does anyone have any ideas as to what might be going on and what to do about it.

Thanks,

   WCDoan