Two things to check.
1. In your manual, p. 65-66, I'm sure you have you SATA ports set up. But how about your IDE port? Make sure it is set to AUTO for both the Primary and Secondary IDE devices.
2. Check jumper settings on the IDE drives. The one on the far end of the cable should be jumpered to be the Master, and the middle one should be the Slave. Or, BOTH can be set to "CS" for Cable Select. Some drives make a difference between "Master alone" and "Master with Slave Present", so choose the correct one if necessary. An IDE channel MUST have a Master to be used, and any second device on the cable then MUST be the Slave.