Thanks. I think trying to install the 3-1/63 software from your disk would be a good idea. It doesn't seem to like my software istallation disk. I have heard MK III units can be picky. I hope that's all it is and nothing more serious. A blank screen scares me. I am going to keep trying but if you are headed this way in the near future I would appeciate the opportunity to try your disk. Just let me know. If I solve it in the meantime I 'll let you know as well.