First check if cabling is correct. SCSI bus termination matters a lot on the MK3. The SCSI cable must be *actively* terminated on *both* ends !
Then check if the SCSI ID of the CD-ROM is set correctly. Remember the number you set.
Then check the firmware menu (hold down Esc key during reset). Check that the SCSI bus is enabled (SCSI Patch or NCR Patch must be disabled) and check that the ID number you chose it not disabled.
Then look into the CD0 file and check that the unit number matches the SCSI ID you chose. Check the tooltypes of CD0's icon, too. Tooltypes override mountlist entries.
Finaly you could get the IDEfix archive from Aminet, unpack it to RAM: and start the FindDevice program. It will tell you if your CD-ROM drive is recognised. If it is, then you can read the correct values for device and unit from the program's listviews.
Bye,
Thomas
