Serial Mouse Stuffed
 

I think theres a ghost in the machine. Everything was working fine up untill yesterday.
I installed the HP printer on the serial port, printed a test page ---no problems. Then while im surfing i realise that mouse's scroll wheel aint working.The mouse is a Microsoft IntelliMouse Explorer 3 USB and PS2 compatible. I was using a serial connector and everything worked fine.
I then changed the mouse to USB and it works fine again now.Every time I go back to the serial connector i screws up.
Following are the relevant sections of XF86Config file:
Section "InputDevice"
# Modified by mouseconfig
Identifier "Mouse0"
# Modified by mouseconfig
Driver "mouse"
Option "Device" "/dev/mouse"
Option "Protocol" "IMPS/2"
Option "Emulate3Buttons" "no"
Option "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
# If the normal CorePointer mouse is not a USB mouse then
# this input device can be used in AlwaysCore mode to let you
# also use USB mice at the same time.
Identifier "DevInputMice"
Driver "mouse"
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5"
Option "Emulate3Buttons" "no"
EndSection

If anyone has a clue please let me know.
Cheers,
Sid.