[RESOLVED] mouse not working!!

Okay i've spent some time now trying to get mouse to work on this computer. here's the deal, i tried putting a new motherboard on this system did not work so i put the old motherboard on this computer... everythign was working before and everyhting was working now except for one thing the mouse. i plugged it into the serial card. it detects it from time to time. But it never works... i've tried using diff mouses but same problem. i've removed it from the system let windows detect it, and it still doesn't work. i went into the bios (old bios) and there is no option for input devices (besides the basic like hd's)... i know the serial card works and the mouses but for some reason i can't get the mouse to work on this system. Any suggestions? thank you