X-Window and Mouse

I installed X-Window (XFree86 3.3), and run the xf86config software berfore 'startx'.
I have a Intellimouse at COM 1 (DOS :) and my video card is a Matrox Millenium.
The xf86config has the option 'MS Intellimouse' and 'Matrox Millenium', so, I put these information.
However, when I started X-Window, a 'X' cursor appears in the center of the screen and I can't move it with the mouse.
I tried everything in the device (/dev/mouse, /dev/cua0, /dev/ttyS0) setup, but it still does not work.
The monitor and video card are working fine.  The problem is the mouse configuration.
I don't think it's necessary to use the 'ln -s /dev/cua0 /dev/mouse', because I reinstalled the Linux, and one of the questions it asks is if you want to link the serial cua0 port with /dev/mouse...  However, it still does
not work...
I used 'setserial /dev/cua0', 'setserial /dev/mouse', and 'setserial /dev/ttyS0':
Results: /dev/cua0, UART: 16550A, Port: 0x03f8, IRQ: 4
It matches exactly with my hardware configuration...

I also tried each of the mouse installation options.  No one worked...

My mouse is working perfectly on Win 95...

I really don't know what's going on.

Thank you.