Type 'version 1230scsi.device' in a shell. Does it return anything? If so, then I suspect either:
Your CD drive is broken
Your SCSI chain is not terminated properly
Your CD mountlist or drive is misconfigured
It's trying to mount your CD drive, configured as unit 1, from the SCSI Kit. If the drive isn't jumpered as unit 1, then the problems you've reported are to be expected.
EDIT: Is your hard drive on the internal IDE bus or the SCSI bus?