🚀 go-pugleaf

I have been having all sorts of problems installing system 3.0
on my external hard disk.  Before trying to upgrade, I had system 2.1
on both my internal (105M Quantum from NeXT) and external (1G Fujitsu)--
the external's SCSI ID was set up so that it would be the default
bootup drive.
After plugging in a friend's CD-rom with the 3.0 CD, and running 
UpgradePrep.app from the CD-Rom tools diskette, it took me a long
time to get the computer to read the CD-rom.  Finally it did and I
did the automatic installation on my external drive, which seemed
OK.  But after installation, booting from my external drive 
puts me into a System Panic window, which eventually stops and
then tries to boot again.  I tried booting from the CD-rom as detailed
in the manuals but this did not work either.  If I unplug the external
and CD-rom I can still boot up from my internal drive, luckily.  
Currently I can't access my external drive at all (I've tried
bsd(1,0,0) from the ROM Monitor to boot from my internal drive, 
but I haven't tried changing the SCSI ID of the external drive,
which involves opening the enclosure and moving the jumpers).

Any help or suggestions would be very much appreciated!  I've been
out of the country for the last four months so I haven't been able 
to keep up with the current folklore on system 3.0--so excuse me if
this is an old question.  Please repost or send email (regular,
not NeXT) to chwe@chwe1.spc.uchicago.edu.

Thanks in advance,
Michael Chwe
Dept of Economics
University of Chicago