> # startx
> 
> Fatal server error:
> 
> Cannot open /dev/mouse, error 6

> # ls -l /dev/mouse
> crw-rw-rw-  1 root  tty  13, 0 May 28 13:47 /dev/mouse

Errno 6 is ENXIO, "Device not configured".  (It's a semi-bug that the X
server doesn't report the strerror() string for the error.)

Either you don't have the mouse driver in your kernel or (for whatever
reason) it wasn't found at boot time.  Check out the boot messages and
see if ms0 was found.  ("ms0 at zsc0 channel 1", or something at least
vaguely like that.)

					der Mouse

			       mouse@rodents.montreal.qc.ca
		     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B