Were you able to zap pram without removing the card first?The service source manual for the PPC upgrade card suggests clearing the pram if there are boot problems, so I did so.
On mine it doesn't respond to cmd-opt-p-r once the card is enabled but I can take the card out, zap pram and then I can insert the card again and it will keep booting in 68k mode until I toggle the ppc card back on.
It sounds like maybe I should try enabling the card from other MacOS versions and see if that makes any difference to what gets stored in the pram config.
