I purchased a couple of IDE/SATA adapters. But, the BIOS fails to recognize these devices when I boot.
If adapters designed specifically to allow IDE drives to work with SATA ports do not work with the drives correctly connected through them and the power connected to the drives (and you've read and complied with any configuration instructions for the devices/on the manufacturers website) then the only other suggestion I can think of is to install a PCI adapter card to get you some IDE ports. You'll need a card that permits booting from IDE with its own BIOS - your best bet would be to get the same shop that sells it to you, to install and test it - that way if THATS also not compatible, they can find one that is or at least not charge you for parts which are of no use to you). Short of this you could always sell the IDE devices secondhand and use the money towards SATA devices - this last plan is what I'd do.