I have also had my Very Old Hitachi Hard Drive and a generic CD burner running on IDE, with the Hitachi as "Master", the CD as "Slave".
Everything worked fine.
I just tried to add a Samsung SATA DVD burner, connected to SATAII2
Not only doesn't it want to talk to the new SATA device, it doesn't want to boot.
On one attempt the whole (nearly new) computer didn't power up at all -- just spun fans for a second.
Scared the heck out of me.
The CMOS Integrated Peripherals is set to "Auto"
Any ideas why new burner would be causing all this trouble?