Mithrandir wrote:Ummmm.... SCSI ID's? Incorrect Termination? Im a little lost here.
If you don't know what this is about, the painful truth is that there a need to work this out for yourself if you plan to play with old Macs. It comes up all the time, and can be confusing — it was known back in the day as SCSI Voodoo for a reason (the rules are arcane and occasionally it just doesn't seem to play by the rules).
The (very) basics run as follows:
Termination: the SCSI chain must be terminated or you will get very erratic behaviour, consistent with what you are getting. Some hard drives have automatic termination (though never the CD drive AFAIK), but some require a jumper across pins usually labelled TE or similar. Some machines (e.g., the Q950) supposedly require a physical terminator plugged into the cable ribbon, so there are just eccentric machines out there. You need to read up on the question, and for this, Google or better still, old Macintosh manuals (Macintosh Bible or the like) would be useful.
ID: The ID numbers of the hard drive and of the CD must also be set by jumpers, and must be set to different numbers, or 'twill likely never boot at all. For a Quadra, it is probably best to set the CD ID to 3 and the hard drive to 0, 1 or 2 (these, indeed, may be all the choices you have on the drive, if it is original).
If this makes no sense, post pics of the drives with jumper configurations.
This page from the mothership might be a good place to start for concepts and terminology: http://support.apple.com/kb/TA27743?viewlocale=en_US