Then it sounds like I'm at an impasse. I've already booted it up holding down the shift key to disable extensions. It doesn't throw up the bus error message, but goes to the regular "starting up" screen and the progress bar just starts to move -- and then it hangs. I've tried letting it sit...
I have an old Performa 6400/180, which has been working fine up until a few days ago. Then one day I booted the machine up and was greeted by the following "bomb" message:
"Sorry, a system error occurred.
bus error
To temporarily turn off extensions, restart and hold down the shift key."...