I recenlty bought a new DVD drive to replace my old CD-burner.
I didn't note how the three devices were setup on the two IDE ports (i.e. which device was on which IDE cable, and what their jumper settings were), i just swapped the CD for the DVD. But it didn't detect it the new DVD drive.
Thinking this maybe a power issue i put the dvd drive onto it's own IDE cable, this seemed to work as the bios could detect it. however, when I plugged the two hard drives onto a single IDE cable - only one of them would be picked up. i think I've tried every combination of Device with - master / slave / CS etc... but none seem to work.
So i thought i'd put the old CD drive back in, but it didn't work either.
Now it seems whenever i put two devices on one IDE port one of them wont be detected.
It worked with the CD drive before i meddled, so i'm sure i'm making a mistake somewhere...