IIGS and SCSI

I have a ROM 01 IIGS with a scsi card installed and connected to an external SCSI HD. I got a hold of a SCSI CD-ROM and connected it to the HD. I installed a terminator block
on the CD drive after connecting it to HD. Now the computer is behaving oddly. Sometimes it boots but almost just hangs up---frozen. The HD is the boot drive. I guess I don't know
much about SCSI. Any help would be appreciated.

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