After Googling the topic a bit more and reading about other people’s experiences with using a Mac Mini as a Media Center with, especially, Plasma TVs with 1024x768 resolution, I figured out the solution to the problem: Overscan on the Mac OFF and Overscan on the Plasma ON. Pretty simple, really. Now the Picture uses the entire screen perfectly while watching a video, with just a little being shaved off the edges of the MacOS GUI.

Tags: Media Center, Mac Mini, MacOS