I recently bought a lite-on LH-20A1S SATA DVD Burner. I currently have a two IDE hard drives and one IDE CD/DVD combo drive. When I enable the SATA 2 port in the BIOS windows will not boot. It seems as though it tries to boot using the SATA ports but will not go to the IDE ports when nothing is found. I tried unplugging the dvd drive, and windows still will not boot. If I don't enable the port in the bios, windows does not recognize the drive. Sorry, I'm still kind of a novice at this.
I ran into a similar problem about 2 years ago with a SATA back up drive when using the PATA for the OS. You have to make sure your IDE settings as well as your BIOS settings are correct. Sorry, I don't remember what exactly the settings are but check you mobo manual and test different BIOS settings for your SATA and IDE. Maybe someone else can give you the exact settings