|I know that some IDE hard drives won't spin up if the IDE cable is reversed, optical drives may be the same. When I first realized this, it took me over 30 minutes to figure that out. The hard drive would spin up with the IDE cable unplugged, but not with it connected. I reversed the connection of the IDE cable and it worked fine. I can't remember if I reversed the connection at the motherboard or at the drive. Some IDE cables are keyed, some aren't. I happened to be using one that wasn't keyed, which is why I got it installed backwards.|
The red stripe on the cable must be on the side closest to the power connector. For the motherboard side, the pins should be numbered. There should be a 1 on the side of the connector on the motherboard where the red stripe on the cable should be.