Hello all, A friend has an older HP desktop that quit reading data CDs. It has a CD burner and a DVD reader. Both are on the secondary IDE channel, configured as cable select. Both are recognized by XP pro; both realize that a disc has been inserted. When I try to explore the DVD reader, it sez 'please insert disc'. The DVD reader will play an audio CD. The CD burner doesn't return an error when I try to explore a data disc--it doesn't do anything. What I've tried: replacing the IDE cable--no change. Switching both from cable select to master/slave--no change. Putting one at a time on the primary IDE channel with the hard drive with both set to cable select--no change. I tried both in a spare computer--they work perfectly. I put a spare CD drive in the friend's HP--won't read a data disc. Unless one or more of you have suggestions, I'm about ready to try to repair XP.