From what I can gather in your posts, you have 3 devices: HD, CD-R and a DVD-ROM.
Why not try one of these combinations:
1) Primary Master: HD; Primary Slave: DVD-ROM; Secondary Master: CD-R;
2) Primary Master: HD; Primary Slave: CD-R; Secondary Master: DVD-ROM;
3) Primary Master: HD; Secondary Master: CD-R; Secondary Slave: DVD-ROM;
4) Primary Master: HD; Secondary Master: DVD-ROM; Secondary Slave: CD-R;
I'm doubtful it'll at all help, but why upgrade the BIOS for your motherboard (if applicable). Also, trying flashing the firmware for your Lite-On drives to the latest revision.
One last point, although it's too obvious, make sure your jumper settings are correct. Check on the drives for help, and check the drive's websites.
It might help you out if I give you my layout:
Primary Master: IBM 80gb; Primary Slave: IBM 20gb; Secondary Master: Plextor CD-R; Secondary Slave: Creative 48x CD-ROM (it's cr@p I know!);
Goodluck!
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Basmic