Hopefully, it's something silly, but I'm not sure what the problem is. I have the screen set to hi-res NTSC and I'm using a 1084 monitor. Everything is fine when I load games from floppy or I allow OS 3.1 to boot up from the hard drive and I play around on the desktop. However, I installed Star Trek AGA onto the hard drive (required -- cannot be played from floppies). When I load it, the screen goes into some whacked-out mode with crazy sort-of horizontal flickering lines. The sound on the game works fine. I thought it might be a problem with the install, but then I also installed an application (SuperJAM music software -- not AGA) on the hard drive, which produces the same screen problem. Any thoughts? Might I have something set wrong in OS 3.1? Thanks for your help.