I've had the same problem a while ago and here's how I solved it:
-uncomment the following lines in /etc/rc.d/rc.modules
Code:
/sbin/modprobe usb-uhci
/sbin/modprobe hid
/sbin/modprobe usbmouse
/sbin/modprobe mousedev
/sbin/modprobe evdev
-edit your /etc/X11/xorg.conf :
Code:
Option "Protocol" "IMPS/2"
Option "Device" "/dev/input/mice"
Hope it helps..