I have retail jaguar as well, it dont see the disk present at all. It will only see my Tiger disk.

i started open firmware, I get this:

PowerMac4,2 4.5.0f4

So, I tried to start it up off the HDD again in verbose mode, I get some strange Cache too big for physical memory (256mb) and kernel panic immediately after that. I have no idea what is installed, thats how the machine was when I got it. panic right away on startup. Thats what verbose said.

But i cannot get it to take an OS as it wont see my OS9 disk, my jaguar disk, but it sees my Tiger disk however it kicks it out saying no support for PowerMac4,2