Regardless of SCSI IDs, I still get a grey screen. I'd like to try SCSIProbe, but the problem is that if I connect ANY external SCSI device, I get a grey screen, and the floppy drive doesn't respond to a disk at all. I've already tried without termination, but still the same result.
I will try without the internal hard drive; thanks for the suggestion!

-JRL

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sounds like a termination issue.

Try this, boot off a floppy, or the internal HD, then once the machine is up, open up Drive Setup, hook-up the external SCSI device(I use to hot swap SCSI drives all the time, never burnt one out), then re-scan the SCSI bus(es) in Drive Setup. Have you tried only one external device, or more? Oh yeah... and don't forget to try 2, or 3 different SCSI cables too just to verify it's not the cable.