Roy, Thanks for you help with the factory disk. Unfortunately it didn't work so today I tried another disk with older software (V 18.2). Someone had suggested to me that one it might be my best bet but it didn't work either. It was interesting though that the unit tried to read it for about five minutes before ejecting it. All the other software versions were ejected within a few seconds. I guess I have about run out of options unless someone thinks the unit needs some sort of coding or diagnostics prior to software installation. I did determine that it designed for a color screen so that's not an issue. The unit appears to be in good shape and the part number indicates a fairly late model MK III (Sept 2001) but maybe I just got a lemon. Any further thoughts would be appreciated as I think I am out of ideas. Thanks!