running the karmic live cd with orca

[michael weaver]

how do i run the live cd of karmic with orca?
for some reason i managed to do it when i got my new desktop pc 
but a couple of days ago i tried to run the live cd and i 
couldn't get the speech to run until i typed alt f2 and orca 
which keeps taking me through the orca setup, loggs me out and i 
can't log back in again when i hear the drums.
what i tried doing was waiting for the cd to stop spinning, 
pressed enter, pressed f5, pressed 3 and enter twice.
i have tried this several times and done it at different times 
but i still can't bring up orca correctly so it must have been 
more by good luck than good management when i was successful at 
doing it.