I have a few new computers that all have a Display Port adapter. I purchased multiple DisplayPort to VGA adapters to hook up projectors or a second monitor. The units I purchased do not have a vga out connection. I can not get this to work. I have a laptop with both vga out and a displayport. I attempt to hook either a monitor or projector and it works fine. If I try to hook it into the displayport through the displayport to vga adapter it will not work. Is there a setting I need to change?