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Discussion in 'PowerPC Macs' started by knowhate, Apr 1, 2015.
I could be wrong, but if I remember correctly those DualDrive adapters only work for adding another hard-drive for storage, I don't believe you can boot from them, except for some occasions.
Have you tried booting the mac while holding the alt key to select the drive to boot from?
This sounds like a jumper issue. Is the IDE drive the one with OS X installed? If so, check and see if you can use "Cable Select" on both the DualDrive and the boot drive.
Here is a link to someone who had what sounds like your very problem, and the solution that worked for them.