PS/2 keyboard and mouse don't work

[myfirstname mylastname]

Hello,

I am very surprised because my PS/2 mouse and keyboard don't work. I
use just TWM window manager. When I launch startx, there are 3 empty
windows and clock window that appear on the screen. Keyboard and mouse
doesnt respond. I am forced to push the reset button to reboot the
computer.
The program xorgconfig is missing on my system then I can not
configure the x server.
My linux distribution is Slackware13.1

These are some lines picked from xorg.conf:

Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen  0 "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection
...

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/input/mice"
	Option	    "ZAxisMapping" "4 5 6 7"
EndSection

Thank you0