Thanks WinLinMac01 for your reply...

I bought a USB to PS2 connector, plugged in both the mouse & kb to it, booted to the disk & iy worked!

finished installation too, do not find Leopard to boot from now..
changed the startupdisk option to leopard, restarts but asks which os to choose from..

my Monster has Ubuntu 8.04, Windows XP & Leopard on it, Leopard not in the list =\
use something like Grub / liloboot ?