Why did you set them as slaves? Sata is Sata - there's no master/slave config. Set 1 of your IDE to Master and the other to Slave - go to boot menu and select the primary boot to be Sata hdd.
Its not booting coz you have a conflicting device = 2 slaves in 1 cable. Just set one as master and try booting again.
Bio's are finicky sunsabitchis they like things a certain way, when its not that way they dont work like there suppose to, chances are it saw 2 slaves and was unsure what to do with your Sata "hard drive" because the BIOS see the HHD's as Logical drives and the CD rom as a Optical therefore is does not have a conflict with the optical drive.
Well, you were right, most of you: setting back one of the drives as master solved the boot problem, but hte drives still do not appear in the bios
Now I can see them from the drives manager (dunno if it's the correct name, my XP is French, but you probably know what I'm talking about) but it says they're not allocated, so I can't read them.
Both of them hold prrrrecious data, so I don't want to format any of them.
I have exactly the same problem, even when I disconnect all other drives, as I have a windows xp install on the ide. I have tried different jumper settings, tried disabling Marvell to no avail.
It's just not seeing the ide drive at all.
I know this is an old thread but I think I am having the complete oposite of this problem. I have tried to remove the IDE DVD drive from my P5Q but when I uplug the DVD drive the system wont boot! any ideas??