SCSI HDD not seen unless IDE HDD connected

[tonyvdb]

There is a hack made called NoIDE on Aminet but I am not sure if it will work on an A1200 as it was writen for an A4000. That may solve your problem. The problem is that the rom searches the IDE first and looks for another bootable device Floppy or other device. The SCSI controler takes longer to start up and thus misses the search. Have you tried doing a soft reset after booting?

[tonyvdb]

Ok, Dumb question but you do have SFS file system files installed on the new SCSI's system (boot) partition and are using the SCSI drives HDToolbox to set up your new drive? Because if its still set up to look at the IDE drives system partition to find the SFS files it will not work.

The best thing to do is copy over all of the IDE's system partition over to the new SCSI system partition. Make sure you have the SCSI drivers installed as well on the new SCSI drive.

[tonyvdb]

I just thought of another possibility. Do you have an active terminator on the SCSI cable? If not this can caus you greif as well.