Help re: bomb error in OS9 on 7200

[M and T]

Hi, I just put cache and extra VRAM in my 7200 and it was running much 
faster so I decided to upgrade it to OS9. It installs happily and for 
the first few times it restarts OK but after a short while it gives me 
bomb errors on startup "Couldn't load CDEF"  "bus error" "An error of 
type 10 occurred"

In all these cases, restarting with shift held down does not work.
I can happily boot into 8.0 and 7.5.5 on other volumes, and I can always 
boot off the OS9 CD-ROM I'm using (actually an iMac install CD) but not 
off the volume I wanted to use as my startup disk.

Does anyone have a suggestion? Google can't tell me anything meaningful 
about what "Couldn't load CDEF" means or about any of the other error 
codes in my situation. Should I run 9.1 instead of 9.0? I didn't do any 
3rd party software installs e.g. Micro$oft Office. Or is the problem 
with my iMac install CD itself? I used it successfully on my 5500 
without this problem occurring though.

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