Well, did you say that you have 2 ide devices and 1 sata device?
Okay, using an 80 wire cable, set the Lite-On jumpers to master and the BenQ jumpers to slave. Plug them both into the IDE port on the same cable.
The Lite-on will go on the end of the cable.
In the computer's bios, set the IDE port to auto type, auto detect.
In windows device manager, remove the IDE port and then restart windows. It will re-install automatically. After it reinstalls, restart again.
This should work. If not, then set both drives to Cable Select. If that doesn't work, then put the BenQ as master on the end of the (80 wire!!!) cable and the Lite-On as slave on the center connector.
*Be sure you're not using a 40 wire cable, because neither of these drives are fully compatible with the older style cable. Use a modern, common hard drive ribbon cable--not the older style.
*Via chipset based motherboards may require a CMOS reset in order to detect a hardware change on the IDE channel. This does not apply to SIS, Intel, Nvidia.
*The BenQ external "L" firmware may be flashed onto the drive if you wish to use ATA66 transfer speed (flash an old external 16x firmware first). It may then be changed to the latest for external firmware. This is not usually helpful, but it can fool some motherboards into behaving correctly. During flashing, have only one drive plugged into the cable (BenQ as Single Master). Some loss of features will result from using the external firmwares, but performance is good. You may also use an external enclosure if connection problems continue.