Adding to Ian Owen's thoughts: the HD in the Centris must have been terminated before you made any change. Remember that termination should be active on the (physically) last device in a chain, so you should have a look at the way you daisychained the drives on the internal SCSI cable: if the cable coming from the motherboard goes to the HD (which is terminated) first and then to the CD-ROM, the computer may ignore the latter completely. Make sure the cable goes from the mobo to a not-terminated drive and then to the terminated one, no matter what they are and which SCSI IDs they use. I can't remember how the 61x(x) machines are organised internally but I'm sure you can solve the problem by either changing the order or by pulling the term jumper on one device and placing it on the other. As for term power, the 610 provides it on the bus AFAIK, but if you're not lucky following the above rules, you may change the term power setting on the terminated device to "term power from drive". If the computer still does not see the CD-ROM after all this, you may have a bad SCSI cable, or the CD-ROM drive may be one not supported by the standard Apple driver. You can see on the drive label if it has an Apple-compliant ROM. If it is a non-Apple drive, use the patch to Apple's CD-ROM driver or use the driver from OS 7.6.1 which supports non-Apple CD-ROM drives.
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