Below are settings that appear to get my computer (a MacBook) to communicate properly with the lab projector. I don’t promise that these settings will work for any other computer.
System preferences -> Displays
This will bring up two windows. One that corresponds to your computer screen and one that corresponds to the projector (see the top of the windows to determine which is which). Note that you can use the gather windows button to bring the projector window on to your computer screen.
Under the arrangement tab on the computer screen window uncheck mirror displays.
Under the display tab on the projector window choose 1024 x 768.
Note that choosing a widescreen resolution for the projector (e.g. 1600 x 900) results in a cut-off picture even though the projector claims to be widescreen.
I hope this is helpful!