Regarding the disabling on extensions and control panels and using a base Mac OS set in Extensions Manager, the Mac would hardly be useful if I cannot have the entire Mac OS running plus third party extensions. It's just disturbing to me that an OS that was pre-installed and released for a specific Mac has software issues on said Mac and causes bus issues. I'm going to not let it get me too disturbed though.
Regarding the Power Macintosh 8600 I have. I got the refurbished power supply because I had a suspicion that more was going on beside software problems because of the noise it was making. Prior to running it with the newly obtained power supply, every supported OS for this Mac threw up a dreaded bus error and I had to pull the plug because even the power button failed to shut it down and the keyboard reset sequence brought it back to the same dreaded bus error on reboot. After installing the refurbished power supply, the Power Macintosh installs and boot every OS supported including Mac OS 9.0. But, Mac OS 9.0 has serious issues that are so overwhelming that it's not useful.
I'm guessing in this case the bus error was a hardware issue? Perhaps a section of the board or component wasn't getting the correct or any current?
Another observation was the method and version of Drive Setup used to format the drive that you are using to install Mac OS 9 onto. There are versions out there that will format the drive and make it seem like everything is fine but once you try to install Mac OS 9 onto the volume it causes the dreaded bus error on reboot. Is there any rhyme or reason to any of this? is this kind of thing documented someplace. You know, as reference so that in the event somebody else that tries this in 2 years will not need to go through this forum or ask silly questions about old equipment that has probably been observed before by many but not exactly broken down and pin pointed to a specific cause?