[Fedora-livecd-list] Problem with ps/2 mouse

Hi I am trying to create a custom iso image and I am hitting a problem with ps2 mouse support ie: when I boot from the lise iso (on pen drive if it makes a difference) There is no mouse - on googling this seems a common problem with users and ps2 mouse -but no mention on how to prevent the issue. I have tried selinux on and off using desktop-base unchanged and various other permutations but no joy any ideas