>I'm going to guess that the MoBo was recently changed and that they >left the original cables installed in the case. This same problem has >come up numerous times over the last 2-3 months. Each motherboard >has it's own unique pinout for the comm connectors on the board. This >is due to the different design and layout characteristics for the board. >The comm port will only work with the cable that was packaged with >the motherboard. Yeah, why didn't I throught of that. I used to know PS/2 mouse need propertory cable, I didn't realize they did it to the serial mouse cable too! Thanks