I have a CS MK III (same card) installed in an A4000T and it isn't easy to bring up that menu on my system. It requires several attempts while the machine is either powering up or re-booting, I can't remember which. I have been able to get it to work though.
You can't just hold the key down, you have to get the timing correct "hitting the key" while powering up or re-booting.
Good Luck,
Jeff
